PDF Studio

A free, browser-based toolkit for everyday PDF tasks. Everything runs locally in your browser — files are never uploaded anywhere, and there's no sign-up.

▶ Live app: https://pdf.akshatdhiman.in/

Features

Tool	What it does
Merge & organize	Combine PDFs and images and arrange their pages in one grid: reorder, rotate, delete, extract, or print 2 or 4 pages per sheet
Crop pages	Trim margins or keep part of a page: drag a crop box per page, or use the same crop on every page
Compress PDF	Shrink PDFs: lossless clean-up, re-save large photos at Recommended / Strong levels, or aim for a target such as 50% smaller
Images to PDF	Turn JPG / PNG / HEIC / WebP / GIF images into a PDF; drag image cards to order the pages
Resize photo	Exact size in px / mm / cm / in, or passport, visa & social presets; drag-to-crop with face guide, max file size (KB), print DPI
HEIC to JPG	Convert iPhone HEIC / HEIF photos to JPG, PNG or WebP at full size; download each one or all as a .zip
Remove password	Unlock a password-protected PDF (with its password) or strip printing/copying/editing restrictions
Lock PDF	Add a password to open (AES-256) and/or block printing, copying, editing or form filling
Redact PDF	Black out areas for good: drag boxes or find text on every page; marked pages are flattened so hidden text is removed
Add text & images	Click (or use the arrow keys) to place text, an image or a ready-made stamp (tick, cross, box, arrow…), with zoom and undo
Watermark	Stamp centered, rotated, semi-transparent text on all or some pages
Fill a form	Fill text fields, checkboxes, radio groups, dropdowns and list boxes; optionally flatten
Compress images	Shrink HEIC/HEIF, JPEG, PNG, WebP, AVIF, GIF and BMP images; save as JPEG, WebP or PNG, resize, compare, download as .zip
Title & info	Change the title shown in tabs and title bars (kept in sync with XMP), optionally as the file name; edit other properties

Page ranges accept forms like 1-3, 5, 8- (8- means "page 8 to the end").

Rotation is available throughout: per page in Merge & organize, Crop pages, Redact PDF and Add text & images (↺ / ↻ next to the page number); per image in Images to PDF, Compress images and Resize photo; and for every page at once on any finished PDF, from the result panel.

Merge & organize can also put 2 or 4 pages on each sheet (side by side, one above the other, or 2 × 2), for example an ID card's front and back on one side of A4, or two pages per printed side. Images added there become one page each.

With several PDFs in Merge & organize, Stack on a file's chip collapses its pages into one card, so the whole file can be moved, rotated or removed in one go; Unstack spreads the pages out again.

Click any preview — an image in Images to PDF, the ⤢ button on a page in Merge & organize, or a page in the result panel — to open it full size in a viewer (← / → to step through, Esc to close).

Running locally

The app is plain HTML, CSS and JavaScript with no build step. Serve the repository folder with any static web server, for example:

npx http-server -c-1 -o

or

python3 -m http.server 8080

and open http://localhost:8080.

Deploying

Every push to main runs the Deploy to GitHub Pages workflow, which publishes the repository to https://pdf.akshatdhiman.in/. You can also start it by hand from the Actions tab.

To host it elsewhere, copy the files to any static host (Netlify, S3, an nginx folder, …):

index.html
styles.css
app.js
icons/
vendor/
└── pdf-lib.min.js

How it works

• pdf-lib does all PDF reading and writing. Its official v1.17.1 UMD build is bundled in vendor/pdf-lib.min.js, so the core tools work offline.
• pdf.js 3.11.174 draws the page previews. It's loaded from jsDelivr with a Subresource Integrity hash and runs with isEvalSupported: false (the mitigation for CVE-2024-4367). If it can't load — for example offline — every tool except Add text & images still works, just without previews.
• heic-to 1.5.2 (libheif compiled to WebAssembly) decodes HEIC/HEIF photos, such as those from iPhones, in browsers that can't do it natively (everything except Safari). It's ~3 MB, so it's only loaded from jsDelivr — pinned with an SRI hash — the first time a HEIC image is added. Photos are converted to high-quality JPEGs before being placed in the PDF.
• qpdf 12.2.0, compiled to WebAssembly (@neslinesli93/qpdf-wasm), decrypts PDFs for Remove password (AES-256, AES-128 and RC4) and encrypts them with AES-256 for Lock PDF. It's bundled in vendor/qpdf/ (~1.3 MB) and only loaded when that tool is used, so passwords and files never leave the device.

Updating pdf-lib

Download the new release's UMD build over the bundled copy, then test each tool:

curl -L -o vendor/pdf-lib.min.js https://cdn.jsdelivr.net/npm/pdf-lib@<version>/dist/pdf-lib.min.js

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