UnuploadedFile conversion · No upload, ever
Convert files without uploading them.
Every converter on this site runs entirely inside your browser. Your files are never sent anywhere — there is no server that could receive them — and each tool carries a live network meter so you can watch the zero for yourself. Turn off your wifi: it still works.
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iPhone photos
HEIC to JPGConvert iPhone HEIC photos to JPG right in the browser — batches welcome, EXIF stripped, works offline.
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Image formats
JPG to PNGRe-encode JPGs as lossless PNGs locally — nothing leaves your device.
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Image formats
PNG to JPGShrink PNGs into JPGs with a quality dial, transparency flattened onto white — all in-browser.
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Image formats
WEBP to PNGTurn WEBP images into PNGs that open anywhere — converted locally, never uploaded.
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iPhone photos
HEIC to PNGiPhone photos to lossless PNG, for editing work where re-compression isn't acceptable.
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Image formats
WEBP to JPGThe WEBP that an upload form or older program refuses — converted to a JPG that opens anywhere.
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Image formats
JPG to WEBPShrink photos for the web: WEBP is typically far smaller than JPG at the same visible quality.
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Audio
M4A to MP3Voice memos and M4A/AAC audio re-encoded as MP3s that play anywhere — converted locally, never uploaded.
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Audio
WAV to MP3Shrink huge WAV recordings into small MP3s with a bitrate dial — all in-browser, nothing leaves your device.
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Audio
Video to MP3Pull the audio track out of your own video files as an MP3 — the video itself never travels anywhere.
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Video
MP4 to GIFTurn a few seconds of your own video into a GIF — clip, width, and frame-rate controls, all in-browser.
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Video
Video to FramesScrub to the exact moment and save that still, or dump frames across a clip — at the video's own resolution, with the timestamp each frame actually landed on.
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Video
Remove Audio From VideoStrip the sound out of an MP4, M4V or MOV by rewriting its index — the picture is copied across untouched, never re-encoded.
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Audio
Audio JoinerPut several tracks end to end into one MP3, in an order you set, with an optional crossfade at each seam.
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Audio
Change PitchMove pitch and speed independently — transpose without the chipmunk, or slow a track down without dropping its key.
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Audio analysis
Morse audio to textDrop a recording of morse code and read it back as text — the tone, speed and timing measured from your file, decoded entirely in this tab.
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Audio analysis
Song BPM counterDrop a song and read its tempo — the beat spacing measured in this tab, with the half or double reading it cannot rule out named beside the answer.
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Audio analysis
MP3 to MIDITurn a solo melody into a MIDI file — one line at a time, with every note's tuning and confidence printed, and chords refused rather than guessed at.
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Code reader
QR code readerRead what a QR code actually says before you act on it — the full address and its real host, printed in this tab and never opened for you.
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Audio analysis
Song key finderDrop a song and read its musical key — with the runner-up key and the margin between them printed beside it, because a key and its relative minor share all seven notes.
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Audio
Ringtone makerCut a song into a ringtone: the edges snap to zero crossings so it does not click, and the loop seam is measured and playable before you export.
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3D printing
STL file viewerOpen an STL and see it: triangle count, bounding box and a rotatable preview, measured in your browser and never uploaded.
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3D printing
3MF to STLTurn a 3MF from your slicer into an STL any tool will open — the declared unit is read and the scale factor is printed, never applied silently.
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3D printing
Lithophane makerTurn a photo into a printable lithophane STL — and see how many grey levels your layer height can actually print before you build it.
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Methodology
How nothing leaves your browserThe whole pipeline, the one thing that downloads once, and three independent ways to verify the zero.
Guides
The background behind the converters — what the formats actually do, what your files carry, and how to audit any converter site for yourself:
Why "no upload" is the whole product
Most online converters are upload services: your photo travels to their server, gets converted there, and a copy exists on someone else's machine — governed by whatever their retention policy says today. For photos of your family, your documents, your whiteboard, that trade is invisible and unnecessary. Browsers have been able to decode, redraw, and re-encode images locally for years; the upload exists for the operator's convenience, not yours.
This site is built the other way around. The tools are static pages that do all their work in the tab, which is why they keep working with the network switched off — and why the privacy claim here is architecture, not policy. A promise can be broken quietly; an architecture can be checked. The methodology page shows you how to check it.