OpenClaw can turn a PDF into structured data in one tool call, then scale that same process into a reusable skill for invoices, contracts, forms, and Office files. The reliable pattern is: send the source document with a narrowly defined extraction prompt, request schema-conforming JSON, validate every response, retain the original and page references, and route partial or low-confidence results to review.
Antihost offers VPS plans with one-click OpenClaw, NVMe storage and a 14-day free trial.
What OpenClaw document parsing automates
OpenClaw’s PDF tool accepts one PDF path or URL, multiple paths or URLs, an analysis prompt, and an optional page filter. That is enough for a focused extraction job: identify the fields you need, ask for a strict output contract, and limit processing to the pages that contain those fields.
As an Amazon Associate I earn from qualifying purchases.
Crashes, No Sound, or Screen Glitches?
Random freezes, missing sound and display glitches usually trace back to one bad driver. Find and replace yours safely.Free scan · under a minuteWindows Errors? Fix Them Before They Spread
Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstallA typical workflow extracts invoice numbers, supplier names, dates, currencies, subtotals, taxes, and totals. The same pattern works for contract clauses, purchase-order fields, application forms, and other documents whose useful content can be represented as records.
OpenClaw does not guarantee that every document is complete or machine-readable. Provider support, embedded text, scan quality, page selection, file size, and image-rendering limits all affect the result. Treat the model response as an extraction candidate that must be validated, not as an unquestioned database write.
#1 Best Overall
- BLUE LIGHT BLOCKING GLASSES: Our blue light glasses for women boast UV400 protection, blocking harmful blue rays from computer screens. With these bluelight glasses women, you can enjoy gaming, reading, or watching TV with no worries of eye strain.
- EYE RELIEF: Our blue light glasses are engineered to reduce blurry vision or strain caused by prolonged screen time. These womens blue light glasses aid in better sleep by preventing blue light from disrupting your natural sleep cycle, helping you fall asleep faster and enjoy a more restful night's sleep, making them the perfect christmas present.
- COMFORTABLE: Crafted from durable material, our trendy blue light glasses for woman or blue light glasses men ensure long-lasting comfort. The high-transmittance lenses accessories, gamer gifts for men, help keep your eyes relaxed. Perfect stocking stuffers, gifts for gamers men, christmas gifts for men, halloween costumes.
- LIGHTWEIGHT: These clear blue light glasses feature a lightweight frame, meaning they’ll stay comfy for long-term wear. Perfect as blue blockers glasses for women or mens blue light glasses, these non-prescription fake glasses for men can be worn throughout the day. The blue light blocking glasses women feature polycarbonate HD lenses, which are anti-reflective and restore true color.
- WORRY-FREE PURCHASE: If you experience any issues, our support team is ready to assist you quickly. These are the perfect costume glasses for cosplay dressing up.
Start with a single PDF
1. Make the document available
Provide a local PDF path, a reachable PDF URL, or an inbound document reference managed by OpenClaw. Keep the original file identifier in your job record so the extracted values can be traced back to the source.
2. Ask for fields and failure behavior explicitly
A vague request such as “summarize this invoice” invites prose and makes downstream processing fragile. State the fields, the required types, the treatment of missing values, and the need for page references.
Extract invoice number, supplier, invoice date, currency, subtotal, tax, and total.
Return only JSON matching the requested schema.
Use null when a field is missing or unreadable.
Include the source page for every extracted field.
Do not calculate values that are not printed in the document.When your runtime accepts several PDF inputs, send them as a batch only when the documents share the same extraction contract. Separate prompts and records are safer when different document types require different fields.
3. Select relevant pages
Use the PDF tool’s page filter when the document is long and you know where the required information appears. Restricting pages reduces unnecessary extraction and makes it easier to detect whether a required field was actually in scope. If you omit a page that contains a total, signature, or definition, the output can be internally consistent but still incomplete.
4. Validate before storing
Parse the response as JSON, check required keys and data types, reject extra prose when your contract disallows it, and apply domain checks such as “tax plus subtotal should agree with the printed total” only when your business rules permit that comparison. A failed check should create a review task or a controlled retry, not silently overwrite the source record.
Rank #2
- WINDEX GAMING WIPES: effortlessly clean all your gaming gear and gaming electronics in one easy step with our new Windex Gaming Wipes
- AMMONIA FREE: our ammonia-free formula is safe to use on all of your favorite gaming equipment like consoles, headsets, controllers, screens, keyboards, and more
- PRE-MOISTENED WIPES: each wipe instantly removes dust, dirt, and stubborn smudges and fingerprints leaving a streak-free shine
- ANTI-STATIC: great for cleaning and wiping down your gaming gear and electronics leaving behind no visible residue
- COMPACT RESEALABLE PACKAGE: store your pack of Windex Gaming Wipes anywhere in your home for whenever a quick and easy wipedown is needed
5. Preserve provenance
Store the original PDF, the exact extracted JSON, the prompt or schema version, selected pages, and any partial-document notice together. Page references let a reviewer verify a value quickly and make corrections auditable.
The Tool Desk
Outbyte PC Repair FREERepair Windows errors before they cause bigger problemsFix Now →Outbyte Driver Updater FREEScan for outdated or missing drivers - takes under a minuteDriver Scan →Use a strict JSON contract instead of free-form prose
A schema makes missing information visible and gives your application a stable interface. The following example is a conceptual contract; implement it with the JSON Schema validator used by your application.
{
"type": "object",
"additionalProperties": false,
"required": ["invoice_number", "supplier", "invoice_date", "currency", "subtotal", "tax", "total", "field_sources"],
"properties": {
"invoice_number": {"type": ["string", "null"]},
"supplier": {"type": ["string", "null"]},
"invoice_date": {"type": ["string", "null"]},
"currency": {"type": ["string", "null"]},
"subtotal": {"type": ["number", "null"]},
"tax": {"type": ["number", "null"]},
"total": {"type": ["number", "null"]},
"field_sources": {
"type": "object",
"additionalProperties": {
"type": ["string", "null"]
}
}
}
}Keep the document’s printed representation separate from normalized values when precision matters. For example, retain the raw date string and currency symbol alongside a normalized ISO date or numeric amount. Do not ask the extractor to invent a value for a missing field; null is more useful than a plausible guess.
Understand native PDF input and fallback extraction
OpenClaw uses native document input for providers that declare native PDF support. In that mode, the provider receives the PDF as a document rather than as text assembled by OpenClaw. For providers without native support, the bundled document-extract plugin uses the clawpdf package, based on PDFium WebAssembly, to extract text and images.
The fallback has an important scan-detection behavior: pages with fewer than 200 extracted characters are rendered to PNG. Image analysis or OCR can then be applied to those rendered pages. The shared render budget is 4,000,000 pixels, so a document with many large pages can become partial even when its file size is modest.
Quick wins for a faster PC:
Clear out junk files and repair common Windows errorsFree Scan →Scan for outdated or missing drivers - takes under a minuteDriver Scan →Rank #3
- Ergonomic & Adjustable Design: Fight "text neck" and improve your posture. Designed for comfort, it offers an adjustable height (7.1in-8.5in) (1.4in adjustable range) and angle (5°-85°) Please note: cell phone stand is only 9 inches tall—the length of a standard pencil
- Without blocking subtitles Perfect for office desk Tiktok Face Time Zoom video—this is the ultimate kitchen desk essential for phones! Perfect viewing experience while reducing neck back strain, A must-have for gamers streamers desk, and anyone who values both style and support!
- Sleek & Stable Design fits Otterbox Case: Say goodbye to bent cables, tangles, and tip-overs! LISEN’s stylish adjustable desk phone holder features a built-in charging hole and smart cable management, keeping your phone secure and your workspace clutter-free cool gadgets for men
- ANTI-SLIP DESIGN free hands: The under 10.00 items easy gadgets back and the bottom of this kitchen essentials for women are fully covered by anti-skid silicone, which LISEN stand up desk decor can provide maximum protection device from any scratches and slides
- Your Perfect Viewing Companion:If your product arrives damaged or breaks within 365 days, reach out to LISEN for a quick and hassle-free solution. Struggling with assembly, like tightening the screw? We’ve got your back! Your experience matters to us. (Product including: phone Holder stand*1, screw*1, hexagon screwdriver*1, specification*1)
| Decision point | What to check | Operational consequence |
|---|---|---|
| Provider capability | Does the selected provider declare native PDF support? | If yes, OpenClaw can pass the document directly; otherwise fallback extraction is used. |
| Text layer | Do pages contain meaningful embedded text? | Born-digital pages can usually follow a text-first path; sparse pages may be rendered for image analysis. |
| Scan quality | Is the page a clear image, skewed scan, handwriting, or a complex form? | OCR and visual review may be required, and recognition quality will vary by document. |
| Page and file limits | Are the requested pages within configured limits? | Exceeding limits produces a partial result rather than a complete extraction. |
| Output contract | Does the consumer need prose or validated records? | Use a schema and a validator for database or workflow integration. |
Know the default PDF limits
When no custom configuration is set, OpenClaw documents a maximum of 20 pages and 10 MB per PDF through agents.defaults.pdfMaxPages and agents.defaults.pdfMaxMb. These are per-PDF defaults, not a promise that a multi-file request can contain unlimited pages or bytes.
If page, text, or image limits prevent complete processing, OpenClaw adds a partial-document notice to the analysis context and to the tool result. Your pipeline should persist that notice and prevent an apparently valid record from being marked complete without review.
| Limit or signal | Documented behavior | What your workflow should do |
|---|---|---|
agents.defaults.pdfMaxPages |
20 pages when unset | Filter pages or raise the configured limit deliberately after checking workload and provider constraints. |
agents.defaults.pdfMaxMb |
10 MB per PDF when unset | Reject, split, or preprocess oversized files; never assume truncation is harmless. |
| Low extracted text | Pages with fewer than 200 characters can be rendered to PNG in fallback mode | Expect an image/OCR path and verify fields visually when the page is important. |
| Shared render budget | 4,000,000 pixels | Reduce selected pages or image dimensions when rendering becomes partial. |
| Partial-document notice | Added when page, text, or image limits make extraction incomplete | Propagate the notice to storage and send the item to review or remediation. |
Handle scanned PDFs with an OCR branch
A scanned PDF may have no usable text layer. In that case, text extraction alone cannot recover the fields. OpenClaw’s fallback can render sparse pages to PNG, but OCR or image-capable analysis is still needed to read those images.
- Detect the condition. Check whether extracted text is empty or unusually short on pages that visibly contain content.
- Render only the needed pages. Use the page filter first so the render budget is reserved for pages containing fields, signatures, or totals.
- Run OCR or image analysis. Keep the page number with every recognized value and record that the value came from OCR.
- Validate aggressively. Compare recognized dates, amounts, and identifiers against expected formats; route handwriting, stamps, tables, and low-confidence characters to a human.
- Retain the image evidence. Store the source PDF and, where policy allows, the rendered page or OCR text used for the decision.
OCR quality is workload-dependent. A clean typed scan, a skewed fax, a multilingual form, and a handwritten signature should not share the same automatic-approval threshold. Verify representative documents before assigning an unattended workflow.
Recommended Free Tools
Extend parsing to Office files with a skill
The community OpenClaw Office Assistant skill covers PDF, DOCX, DOC, XLSX, XLS, PPTX, and PPT. Its documented approach uses deterministic Python libraries for modern Office files, falls back to OCR when a scanned PDF lacks embedded text, returns stable JSON for post-processing, and supports summaries, field extraction, rough structure recovery, and multi-document comparison.
Rank #4
- Easy Installation: Our gaming lights have been designed to enhance your entertainment experience. Simply position the led light bar next to your TV or game console to create a game room environment with ease. They come with USB power and a 60 inch cord for direct mounting and mobility
- Audio Syncing & Extensive Mode: The built-in high-sensitivity music sensor allows you to sync the TV led lights to your favorite music. Lights react and move to the beat of music, film and game audio, creating an incredible immersive sound and light experience – and all without the need for an additional hub. You can choose from 64+ patterns, including strobe, illusion, jump, energy, gradient, running, chasing, fluttering mode etc. Each mode can be applied to different scenes
- 64+ Chasing IC+RGB & W Effect: The independent control design of IC+RGB and white all-in-one multifunctional rgbw led bar lights monitor backlight allows you to easily switch the led lights for desk between IC+RGB and white to enjoy a variety of lighting effects, you can choose white lighting mode with high brightness for better illumination when working, etc. Choose IC+RGB lighting mode when you need to create an entertaining atmosphere for the light show, 16 million colours of Color changing rgb light bar let you dance to the beat and create a dynamic party atmosphere
- Dynamic and Dimmable Lights: 1%-full brightness free brightness adjustment gives you the flexibility to adjust dimmable led light bar for room decorations or a variety of occasions
- USB Powered: USB light bars for room can be powered by powernank, usb charger, TV, Monitor, laptop PC mainframe, making behind TV led lighting bar easy to install in any location.TV led lights are powered by the TV usb interface / PC mainframe, can be turned on/off synchronously with TV / PC
| Package or utility | Role in the Office workflow |
|---|---|
pypdf |
PDF text and document handling |
python-docx |
DOCX extraction |
openpyxl |
XLSX workbook extraction |
python-pptx |
PPTX slide extraction |
poppler-utils |
Additional PDF conversion and rendering support |
tesseract-ocr |
OCR for image-based pages |
tesseract-ocr-chi-sim |
Chinese/English OCR support recommended by the project |
libreoffice |
Broader Office conversion coverage |
antiword and catdoc |
Legacy DOC conversion support |
The skill is text-first. It does not promise perfect preservation of layout, chart semantics, or complete visual structure. Use page, slide, sheet, and cell references where possible, and require review for charts, merged cells, diagrams, and documents whose meaning depends on visual placement.
Build a reusable OpenClaw parsing skill
OpenClaw skills are Markdown instruction packs. The official skills documentation requires, verbatim, “Every skill needs at minimum a name and description in the frontmatter.” A useful skill adds the extraction contract and its operational guardrails.
Define the skill frontmatter
---
name: invoice-document-parser
description: Extract invoice fields from PDFs and Office documents into validated JSON with page references.
---Specify the workflow in the instructions
- List accepted formats and how inbound references are resolved.
- State the exact fields, data types, units, date format, and null behavior.
- Require page, slide, sheet, or cell references for every populated field.
- Tell the agent to distinguish printed values from calculated values.
- Define the JSON-schema validation step and the response to invalid JSON.
- Set retry limits and a human-review route for missing, conflicting, or low-confidence fields.
- Specify where the source file, extracted record, validation report, and partial notice are saved.
Add readiness checks
Skill readiness can depend on required binaries, environment variables, configuration paths, and operating-system constraints. A host may have OCR or Office conversion utilities installed while a sandbox cannot access them. Check dependencies before processing and fail with a clear setup message that names the missing capability.
Readiness checks:
- confirm the input path or URL is readable;
- confirm the configured PDF and file-size limits;
- check required OCR or conversion binaries when the selected format needs them;
- verify the output location is writable;
- record the skill version and schema version.Choose between a tool call, a skill, and a plugin
OpenClaw’s architecture separates three purposes: tools let an agent act, skills teach a reusable workflow, and plugins add integrations or runtime surfaces.
| Approach | Best fit | What you must provide | Main limitation |
|---|---|---|---|
| One-off PDF tool call | A single document or an exploratory extraction | Source path or URL, focused prompt, optional page filter | Consistency, validation, and storage rules must be handled by the calling process. |
| Reusable skill | Repeated invoices, contracts, forms, or multi-format jobs | Markdown instructions, schema, dependency checks, retry/review behavior, retention paths | It still relies on the available tools and provider capabilities. |
| Plugin integration | A new provider, channel, hook, conversion layer, or external system | Runtime integration and a defined interface to the workflow | More deployment and maintenance surface than a skill. |
Start with a tool call while you learn the document’s variation. Promote the process to a skill when the fields and review rules repeat. Add a plugin only when the missing capability is an integration or runtime surface rather than instructions.
Best Value
- Compatible with Wide Screens - To ensure compatibility with the dual monitor mount, your each monitor must meet three conditions at the same time: First, computer screens size range: 13 to 32 inches. Second, screen weight range: 4.4 to 19.8 lbs. Third, the back of the monitor screen must have VESA mounting holes with a pitch of 75x75mm or 100x100mm.
- Regarding the compatibility with desks - Your desk must meet three conditions at the same time: First, desk material: Only wooden desks are recommended, plastic or glass desks cannot be used. Second, desk thickness range: 0.59" - 3.54". Third, the bottom of the desk should not have any cross beams or panels, as this will interfere with installation. We recommend carefully checking that your desk and monitors meets all above conditions before purchasing.
- Dual C-Clamp Hold - Worried your dual monitors might wobble or slip? Our upgraded base uses a larger platform plus a dual C-clamp structure to lock the dual monitor arm firmly to your desk. Each arm safely keeps your screens steady while you type, click and game—no shaking, no sliding, just a clean and secure setup you can trust every day. It also provides Grommet Mounting installation choice, both options ensure stable and secure fixation for your 0.59" - 3.54" desk.
- Full-Motion Adjustment For Comfortable View - Pull the screen closer when you’re deep in a spreadsheet, push it back to watch videos, or rotate to portrait for coding — moving everything smoothly with just one hand. The monitor stand offers +85°/-50° tilt, ±90° swivel and 360° rotation. Raise your monitor up to 15.75″ to support a healthy sitting posture. Whether you’re working from home, gaming through the night, or switching between video calls and documents, getting the screens to your natural line of sight helps relieve neck, shoulder and back strain so you can stay focused longer with less fatigue.
- Keep Your Desk Organized: By lifting both screens off the desktop, this dual monitor stand opens up valuable space for your keyboard, notebook, docking station or a simple, clutter-free work area. Built-in cable management guides wires along the arms, keeping cords out of sight and out of the way. Enjoy a tidy, modern workstation that looks as good as it feels to use.
Design a production-safe processing loop
- Ingest. Assign a document ID and retain the original bytes or an immutable reference.
- Classify. Select the extraction contract for an invoice, contract, form, spreadsheet, or presentation.
- Scope. Choose pages, slides, sheets, or ranges; record the selection.
- Extract. Run native PDF input when supported and fallback/OCR paths when required.
- Validate. Check JSON syntax, schema, required fields, types, and document-specific consistency rules.
- Assess completeness. Treat a partial-document notice, missing source references, or unreadable fields as review conditions.
- Persist. Store source, output, validation results, notices, and version metadata together.
- Review or publish. Send exceptions to a queue; only publish records that meet your completeness policy.
For retries, preserve the first response and reason for retry. A second extraction should be distinguishable from an overwrite, especially when a provider, page selection, or OCR path changes.
Troubleshoot common failures
| Symptom | Likely cause | Correction |
|---|---|---|
| Only the first portion of a long PDF is represented | The default 20-page limit or a configured page filter | Select the required pages explicitly or adjust the limit, then verify completeness. |
| The file is rejected or the result is partial | The PDF exceeds the 10 MB default or another configured size boundary | Split or preprocess the source, or change configuration deliberately and record the change. |
| Scanned pages return empty fields | No usable embedded text | Use rendered-page OCR or image analysis and send poor-quality pages to review. |
| Images disappear from fallback extraction | The shared 4,000,000-pixel render budget was exceeded | Reduce selected pages or rendering dimensions and process the remainder separately. |
| The response contains prose around JSON | The prompt did not impose an output contract or the provider did not follow it | Parse defensively, reject nonconforming output, and retry with an explicit JSON-only instruction. |
| Values look plausible but cannot be verified | No page or source references were required | Make references mandatory and retain the original document with the record. |
| Office conversion works on one machine only | Required binaries are absent or inaccessible in the execution sandbox | Run readiness checks and provide a setup error instead of silently switching extraction behavior. |
| Tables or charts are structurally wrong | The Office skill is text-first and does not preserve full visual semantics | Use a visual review path and treat recovered structure as approximate. |
Set realistic accuracy expectations
The documented workflow does not publish validated accuracy, latency, or cost benchmarks for document parsing. OCR quality, layout recovery, chart interpretation, and provider behavior are workload-dependent. Before production use, test a representative set that includes clean born-digital PDFs, scans, rotated pages, tables, multilingual text, long files, and deliberately incomplete documents.
Measure the outcomes that matter to your process: field-level correctness, missing-field rate, false extraction rate, percentage of records requiring review, and frequency of partial-document notices. Keep test documents and expected answers versioned so changes to prompts, providers, skills, or OCR dependencies can be compared.
Implementation checklist
- Use a focused prompt with an explicit schema and null policy.
- Apply page filters to large documents only when the selected pages are known to contain every required field.
- Record whether extraction used native PDF input, fallback text extraction, or OCR.
- Validate JSON before any database or workflow update.
- Require page, slide, sheet, or cell references for populated fields.
- Persist the original source and every partial-document notice.
- Check OCR and Office-conversion dependencies inside the actual execution environment.
- Route low-confidence, visually complex, conflicting, or incomplete results to a human queue.
- Promote repeated work from a one-off tool call to a skill; use a plugin only for a new integration or runtime surface.
How to automate document parsing with OpenClaw
For a single PDF, the PDF tool plus a strict prompt and schema validation is the smallest dependable solution. For scans and Office formats, add the appropriate OCR and conversion path through a skill, document its dependencies, and preserve source references. The automation becomes production-ready when partial results are explicit, every value is traceable, and exceptions have a defined review route.
Quick Recap
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
