161 converters · one page · zero uploads
Convert any file.
It never leaves your device.
Images, audio, video, documents, and data, converted free in your browser. No uploads, no signup required, no watermarks.
Drop files here
or browse your device. Free, no signup required, no watermarks.
Files are processed on your device, never uploaded
Most searched
Popular conversions
Jump straight to the tool you need. Each one is a dedicated converter.
Five kinds of file
Every format you'll meet
Images
40 tools
Convert photos and graphics between PNG, JPG, WebP, HEIC, GIF, BMP, ICO, SVG, and AVIF.
Audio
45 tools
Convert music and recordings between MP3, WAV, FLAC, OGG, AAC, M4A, Opus, WMA, and AIFF.
Video
35 tools
Convert video between MP4, WebM, MOV, AVI, and MKV, or turn video into GIF and extract audio.
Documents
17 tools
Convert PDF, Word (DOCX), Markdown, HTML, and plain text documents.
Data
24 tools
Convert JSON, CSV, Excel (XLSX), YAML, XML, and TSV data files.
The difference
Why your files stay on your device
Most converter sites upload your files to their servers. We compiled the conversion engines to WebAssembly instead, so your browser does everything.
Private by design
Conversions run in your browser using WebAssembly. Your files are never uploaded to any server. There is no server to upload to.
Fast, no queue
No upload wait, no processing queue, no email link. Your own device does the work, so most conversions finish in seconds.
Actually unlimited
No daily caps, no account walls, no watermarks. Convert one file or one hundred. It costs us nothing, so it costs you nothing.
Batch when you need it
Convert up to three files at once free. Pro batches without limits and downloads whole runs as a single ZIP.
Three steps
How it works
Drop your files
Drag files into the converter or browse your device. Add as many as you like.
Pick the format
Each file shows every format it can become. Choose per file, or keep the smart default.
Convert & download
Conversion runs locally in seconds. Download each file, or ZIP whole batches with Pro.
From the blog
Recent posts
File formats, digital privacy, and honest looks at the tools we use.
October 16, 2026 · 3 min read
JSON to CSV without writing code: a guide for the spreadsheet people
Some tool just handed you a .json file and you need it in Excel. You don't need Python, you don't need to learn what an array is, and your data doesn't need to visit anyone's server.
October 8, 2026 · 4 min read
MOV won't play on Windows? Why iPhone videos stall, and the two-minute fix
You shot a video on your iPhone, sent it to a PC, and got silence, a codec error, or audio with a black screen. Here's what MOV actually is, why Windows chokes on it, and how to convert it without uploading a gigabyte.
September 30, 2026 · 4 min read
WAV vs MP3 vs FLAC: which audio format do you actually need?
One is huge and perfect, one is small and good enough, one is the clever middle. Here's how the three formats work, when each wins, and the conversion mistakes that quietly ruin audio.
Questions
Questions people ask
Is FormatFusion really free?
Yes. Every converter is free with no watermarks and no account required, for files up to 1 GB each. The site is supported by ads, which is why we never need to charge you.
Are my files uploaded to your servers?
No, and this is what makes FormatFusion different. All conversion happens locally in your browser using WebAssembly. Your files never leave your device, which also means there's nothing for us to store, scan, or leak.
Is there a file size limit?
Free converts files up to 1 GB each, which is many times more than typical converter sites allow on their free tiers. Pro removes the cap entirely, up to what your device's memory handles (roughly 1.5 GB for video).
Does it work on my phone?
Yes. FormatFusion works in any modern browser on iPhone, Android, Mac, Windows, and Linux. Converting iPhone HEIC photos to JPG is one of our most popular tools.
How is quality preserved?
Lossless targets (PNG, WAV, FLAC, ZIP-packed pages) keep every bit of the original. Lossy targets (JPG, WebP, MP3) use high-quality settings of 92% for images and 192 kbps for audio, matching what professional tools default to.