Nothing ever leaves your computer.
FileExpert runs entirely in your browser. No server, no upload, no cloud copy, no data broker. When you close the tab, it's gone.
local · 0 uploads
local · free · no sign-up
Change any file extension.
Drop a file. Pick a format. Download. That's it — runs in your browser.
Drop a file here
or browse · up to 100 MB
Convert to
✓ Local — file never uploaded✓ No watermark✓ No sign-up
25 tools · ⚡ instant · runs entirely in your browser
how it works
Three steps. No download.
Every other converter wants your email, your credit card, and 90 seconds of your life. Ours wants none of that.
Drop a file
Drag one or use the picker. Any format FileExpert recognises — single files or batches, all fair game.
Pick the extension
We suggest the smart default based on your file. Or browse every format we cover across images, docs, and data.
Download
The file never leaves your browser. FileExpert works offline once loaded, doesn't watermark, and keeps zero logs.
why fileexpertEverything you expect.
Everything you expect.
Plus the parts you didn't.
Batch up to 20 files.
Drop a stack of images and bundle them into a PDF, or split a multi-page PDF back out — same workflow either way.
report.docx
notes.png
output.pdf
Works on every device.
Chrome, Safari, iPad, Android. No app store, no install. A bookmark is all it takes.
Smart detection
Got a mystery file? Our type checker reads the magic bytes.
✦
Keep quality
Lossless where the format allows it. Adjustable quality where it doesn't.
100% · lossless
Privacy by default
No accounts, no tracking pixels, no third-party file processors. Read the privacy notes.
0 uploads
0 cookies
0 cookies
12 formats supportedIf it has an extension,
If it has an extension,
we probably speak it.
From the everyday (.jpg, .pdf) to the niche (.heic, .avif, .tsv). Don't see yours? Tell us — we add a few each month.
Images
.jpg.png.webp.heic.heif.avif.svg
Documents
.pdf
Data
.json.csv.tsv.txt
Utility
any
loved by normal people
Not another pro tool.
FileExpert is built for the person who got a .heic from their sister and can't open it, not for the 10× engineer with a CLI.
“My mum sent me 80 photos from her new iPhone and none of them opened. FileExpert fixed it in thirty seconds. I’ve bookmarked it forever.”
Priya K.
Accountant, London
“I keep a FileExpert tab open all day. It’s the closest thing to a utility I’ve ever paid for on the web — except it’s free.”
Marcus T.
Teacher, Austin
“Every other converter wanted my credit card to download a 200KB PDF. FileExpert just… worked.”
Ana R.
Freelance designer
faq
Questions, answered.
Is my file actually safe?
Yes — FileExpert runs in your browser using the Canvas API and WebAssembly. Your file never touches our servers. You can literally turn off wifi after loading the page and it will still work.
Is FileExpert really free?
Every tool is free. No signup, no watermarks, no hidden usage limits. Free forever is the product, not a trial.
Why is it so much faster than other converters?
Most converters upload your file to a server, process it there, and send it back — three round-trips over your network. FileExpert runs entirely in your browser. No upload means no wait: most conversions finish in milliseconds.
Will it actually preserve quality?
Where the format allows it, yes — lossless. Where it doesn't (e.g. .heic → .jpg), we use the highest quality setting by default and show you the before/after size.
What's the file size limit?
100 MB per file by default, larger on dedicated tools. Since everything happens locally, your computer's RAM is the real ceiling.
Does it work offline?
Once a tool page has loaded, most tools keep working without an internet connection. First-time loads (like HEIC decoding) need a connection to fetch the WebAssembly module.
Can you add [some weird format]?
Probably. Drop us a note — we add 2-3 formats per month based on what users ask for.
Got a file that won't open?
We've got you.
FileExpert is free forever for the basics. No account, no credit card.
Change a file now