60 tools · files never leave your device

Every file tool you need.
None of the uploading.

PDF, image, video, text and developer tools that run as WebAssembly in your browser. Free, unlimited, no account. Open a tool, drop a file, and watch your network tab stay empty.

Merge PDF Compress images HEIC to JPG

Popular tools

The ones people reach for every day.

Merge PDF Combine several PDFs into a single document, in the order you choose. On-device Compress PDF Reduce file size by rebuilding and recompressing the PDF structure, losslessly. On-device PDF to JPG Render each page as a JPG or PNG at the DPI you choose. On-device HEIC to JPG Turn iPhone HEIC photos into JPG or PNG that open anywhere. On-device Compress Image Smaller JPG, PNG and WebP with a live before/after comparison. On-device Resize Image Scale to exact pixels or a percentage with Lanczos quality; batch supported. On-device Split PDF Extract page ranges or burst a PDF into one file per page. On-device JPG to PDF Turn one or many photos into a tidy PDF with your choice of page size. On-device PNG to JPG Batch convert PNG images to JPG with quality control. On-device JSON Formatter Pretty-print, minify and validate JSON with precise error messages. On-device QR Code Generator URL, Wi-Fi, text, email and vCard codes as PNG or SVG. Never expires. On-device Word Counter Live word, character, sentence and paragraph counts with reading time. On-device

Why on-device?

Private by construction

Local tools have no upload step. The code that converts your file runs in your tab and the result is written straight to your Downloads folder.

Faster than a round trip

No queue, no upload progress bar, no waiting for a server. A 50 MB PDF compresses in the time it would take to start uploading it.

Works offline

Install Kiln as an app. After the first visit the tools you have used keep working on a plane or a bad connection.

No limits, no ads

There is no server bill for local tools, so there are no file-size caps, no daily limits and nothing to upsell. Pro exists only for AI features that truly need a server.