PDF tools

Guide to every PDF tool: merge, split, compress, sign, protect, OCR and more.

All guides

Getting started: What OpenFile is, how to use your first tool, install it as an app and work offline.
How OpenFile works: The zero-upload privacy architecture, the processing engines and first-use model downloads.
Keyboard shortcuts: Global, command palette, docs and Sketch board keyboard shortcuts.
PDF tools: Guide to every PDF tool: merge, split, compress, sign, protect, OCR and more.
Convert: Guide to converting between PDF, Word, Excel, PowerPoint, Markdown, HTML and images.
Image tools: Guide to compressing, resizing, converting, background removal, upscaling and editing images.
Video tools: Guide to trimming, compressing, converting, GIFs and recording video in the browser.
Audio tools: Guide to editing, converting, recording and transcribing audio on-device.
Developer tools: Guide to JSON, JWT, hashes, regex, QR codes, cURL conversion and other developer utilities.
Text & data tools: Guide to diffing, counting, case conversion, Markdown and text cleanup tools.
Design tools: Guide to colors, gradients, CSS, favicons, SVG and the Sketch whiteboard.
Workspace pipelines: Chain steps into reusable recipes and batch-process hundreds of images or PDFs.
Sketch board: The infinite whiteboard: tools, boards, sharing, presenting, exporting and shortcuts.
Favorites, history & settings: How favorites, recent tools, activity history and settings are stored locally in IndexedDB.
Self-hosting: Deploy OpenFile to Vercel, GitHub Pages, any static host or Docker with nginx.
API reference: The optional Vercel serverless routes: /api/health, /api/fetch-page and /api/meta.
Browser support: Which browsers and platform features each group of tools needs.
FAQ: Answers to common questions about privacy, limits, offline use and troubleshooting.
Contributing & adding a tool: Set up the project, follow the tool conventions and add a new tool to the registry.
Changelog: Release notes for every OpenFile version.
Install on every device: Install OpenFile as a web app, a desktop app for Windows, macOS and Linux, an Android APK or on iPhone.
Using tools: Drop zones, batches, page ranges, presets, history, undo and where your downloads go.
Themes and accessibility: Black, dark, light and system themes, accent colors, fonts, density, reduced motion and keyboard use.
Offline and PWA: How the service worker caches the app, engines and models, how updates work and how to clear data.
Open with and share target: Open files from your system with OpenFile and send files to it from the share sheet.
Local AI: Which AI models run on your device, their sizes, first-run downloads, WebGPU or CPU, cancelling and privacy.
Privacy and security: No uploads, how to verify it yourself in the DevTools network tab, headers and what is stored locally.
Formats supported: A searchable matrix of every input and output format, generated from the tool registry.
Full tools reference: Every tool with its description, formats and link, generated from the registry. Filter and search.
Troubleshooting: Large files, memory, browser support, Safari quirks, unsigned app warnings and quick fixes.
Developer guide: Architecture, adding a tool, batch files, tests, builds, Pages and Vercel base paths and releasing the apps.
Roadmap: What has shipped and what comes next, generated from the project roadmap.
Data: Guide to every Data tool: csv, excel, json, sqlite, parquet, maps and gps.
AI: Guide to every AI tool: on-device ai for images, text and documents.
3D: Guide to every 3D tool: view and convert glb, gltf, obj, stl, ply and more.
Archives: Guide to every Archives tool: open and create zip, 7z, tar, gz and rar.
eBooks: Guide to every eBooks tool: read and convert epub, mobi, fb2 and comics.
Fonts: Guide to every Fonts tool: convert, inspect and subset ttf, otf, woff.
CAD: Guide to every CAD tool: view and convert dxf and other drawings.
Subtitles: Guide to every Subtitles tool: convert, sync and edit srt, vtt, ass.
Security & Privacy: Guide to every Security & Privacy tool: scrub metadata, lock files, hide messages, redact personal data.
Maps & GPS: Guide to every Maps & GPS tool: gpx elevation, splits, heatmaps, privacy zones and location codes.
Office & Sheets: Guide to every Office & Sheets tool: merge, split, compare and pivot spreadsheets, clean word files.
Science & Education: Guide to every Science & Education tool: equations, graphs, chemistry, matrices, logic and primes.
Creator Studio: Guide to every Creator Studio tool: audiograms, vertical video, carousels, word clouds and chapters.

Tools

Merge PDF: Combine multiple PDFs into one ordered document with drag-and-drop sorting.
Split PDF: Split by ranges, every N pages, or extract each page into a ZIP.
Compress PDF: Shrink PDF size with smart image downsampling and stream compression.
Organize PDF: Visually reorder, rotate, duplicate and delete pages with thumbnails.
Delete Pages: Remove selected pages and download the trimmed document.
Extract Pages: Pull selected pages into a brand-new PDF.
Rotate PDF: Rotate selected pages or the whole document.
Add Page Numbers: Stamp page numbers with position, format and font controls.
Watermark PDF: Stamp text or logo watermarks with opacity, rotation and tiling.
Header & Footer: Add running headers and footers with dates, titles and page tokens.
Sign PDF: Draw, type or upload a signature and place it anywhere, plus dates and initials.
Edit PDF: Add text, shapes, highlights, images and freehand drawing to any page.
Protect PDF: Encrypt a PDF with a password and set print/copy permissions.
Unlock PDF: Remove the password from a PDF you have access to.
Redact PDF: Black out areas or auto-find emails, phones and card numbers, then flatten.
PDF to Grayscale: Convert color PDFs to grayscale or high-contrast black & white.
Crop PDF: Trim page margins visually or by exact measurements.
Flatten PDF: Flatten form fields and annotations into static page content.
PDF Metadata: View and edit title, author, subject, keywords and dates.
Fill PDF Form: Detect form fields and fill text boxes, checkboxes and dropdowns.
Compare PDF: Side-by-side text diff of two PDF versions.
N-up / Booklet: Print 2, 4 or 9 pages per sheet, or impose a booklet.
OCR PDF: Recognise text in scanned PDFs and images in 10+ languages.
PDF Reader: Fast viewer with search, zoom, thumbnails and outline.
Insert Pages: Insert blank pages or pages from another PDF at any position.
Repair PDF: Rebuild broken or malformed PDFs by re-writing the document structure.
Invoice Generator: Create GST/VAT invoices with automatic totals and a polished PDF.
Resume Builder: Fill a form, pick a template, download an ATS-friendly PDF resume.
Change PDF Page Size: Scale or fit pages to A4, Letter, A5 or a custom size, with margins. Text stays sharp.
Split Pages in Half: Cut two-page spreads and two-up scans into single pages, left and right or top and bottom.
Flip / Mirror PDF: Mirror PDF pages left to right or top to bottom for transfers, back-lit prints and glass scans.
Overlay PDF: Lay one PDF over or under another: letterheads, stationery, form backgrounds and stamps.
Print Poster (Tile PDF): Enlarge one page across several sheets with overlap, cut marks and sheet labels.
Alternate & Mix PDFs: Interleave front and back scans into one double-sided PDF, or mix pages from several files.
Edit Bookmarks / Outline: Add, edit, reorder and nest PDF bookmarks, or build them from the headings in the text.
Edit PDF Links: Add, move and remove web and page links, or turn every web address in the text into a link.
Create Fillable PDF Form: Add text fields, checkboxes, radio buttons, dropdowns, lists and signature fields to any PDF.
PDF Attachments: List, extract, add and remove files embedded inside a PDF.
PDF Viewer Preferences: Set the opening page, zoom, page layout, side panel, full screen and toolbar options.
Remove Annotations: Strip comments, highlights, drawings, stamps, links or form fields, by type and page.
Sanitize PDF: Remove JavaScript, embedded files, links, metadata, comments and hidden layers before sharing.
PDF Inspector: See page sizes, fonts and whether they are embedded, images, scripts, version, encryption and word counts.
Rasterize PDF: Turn every page into an image-only PDF at the resolution you choose.
Remove Blank Pages: Find and delete blank or nearly blank scanned pages automatically, with a manual override.
Adjust PDF Colors: Dark mode, invert, grayscale, sepia, black and white, contrast and color replacement for PDFs.
Extract PDF Images: Pull embedded images out of a PDF at original quality and download them as a ZIP.
Search in PDFs: Full-text search across many PDFs at once, with context and the match highlighted on the page.
Web-Optimize PDF: Linearize a PDF for fast web view and pack it with compressed object streams.
PDF to PDF/A: Convert to archival PDF/A-1b, 2b or 3b: color profile, XMP metadata, no scripts, with a strict image mode.
Check PDF/A: Quick PDF/A report: identification, fonts, color profile, encryption, scripts, transparency and metadata.
PDF Accessibility Checker: Check tags, alt text, language, title, headings, table headers, tab order and real text.
Digital Signature (Certificate): Sign a PDF with your .p12 or .pfx certificate, visibly or invisibly, without uploading it.
Verify PDF Signatures: Check digital signatures: was the file changed, who signed it, certificate chain and timestamps.
Scan to PDF: Turn phone photos or your camera into a clean multi-page PDF: edge detection, straightening, black and white.
Cover Letter Builder: Write a cover letter from a template, pick a design, and bundle it with your resume and certificates into one PDF.
E-Invoice Generator: Create EN 16931 e-invoices: Factur-X / ZUGFeRD PDF with embedded XML, or XRechnung in CII or UBL.
E-Invoice Viewer & Validator: Read XRechnung, UBL, CII and Factur-X / ZUGFeRD invoices in plain language and check their totals and rules.
PDF Embed Code: Generate HTML to embed a PDF on your website: a PDF.js viewer that works on phones, or iframe and object code.