Why FileLocally
Free PDF & image tools that never see your files
FileLocally is a privacy-first alternative to upload-based converter sites. Every tool on this page — the image compressor, the JPG-to-PDF converter, the PDF merger and the SVG rasteriser — runs entirely inside your web browser using the HTML5 File API, the Canvas rendering engine and the open-source pdf-lib library. Your documents are read into your device's memory, transformed on your own CPU, and handed straight back to you as a download. No account, no watermark, no queue, and critically: no upload.
How to compress an image online without uploading it
Step 1 — Add your images
Drag PNG, JPG, WebP, SVG or GIF files into the dropzone, or click to browse. Each file appears as a thumbnail card showing its current size.
Step 2 — Pick a format and quality
WebP typically produces files 25–35% smaller than JPG at the same visual quality, which is why it's the default. Move the quality slider and FileLocally re-encodes a sample in real time to estimate your savings before you commit.
Step 3 — Download
Press Convert & Compress and every image is re-encoded locally. Files download individually so you keep full control.
How in-browser PDF merging works
When you merge PDFs on FileLocally, the pdf-lib library parses each document's internal object tree in JavaScript, copies the pages into a fresh document in the order you set, and serialises the result back to bytes — all inside the browser sandbox. Because the work never touches a server, a 200 MB merge is as private as a 200 KB one, and there is no file-size ceiling other than your device's available memory.
Is client-side conversion safe for confidential documents?
Yes — and it is the reason this site exists. Upload-based converters require you to trust a stranger's server with contracts, ID scans, and medical records. A client-side tool removes that trust problem entirely: you can even load this page, disconnect from the internet, and every tool keeps working. The "0 B uploaded to servers" indicator in the header is not a marketing line; it is a description of the architecture.
Frequently asked questions
Are my files uploaded to a server?
No. FileLocally runs entirely inside your browser. Files are read into local memory, processed on your device, and never transmitted over the network.
Is FileLocally really free?
Yes. Every tool is free with no sign-up, no watermarks and no artificial limits. The site is supported by clearly-labelled on-page advertising.
How does in-browser image compression work?
Your image is decoded onto an HTML5 canvas and re-encoded at your chosen quality using the browser's native encoder — instant and private.
Can I merge password-protected PDFs?
Encrypted PDFs must be unlocked first. FileLocally will tell you if a file is protected so you can remove the password in your PDF reader.
What's the maximum file size?
There is no hard limit — capacity depends on your device's RAM. Most modern laptops comfortably handle multi-hundred-megabyte PDFs.