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Convert a file without uploading it
The conversions people ask for most are below, each opening the converter already set to that pair, with a note on what the change keeps and what it costs. For anything else, start from the format you already have.
116 pairings
Image conversions
Photos, screenshots, icons and graphics — including the iPhone HEIC files most upload forms refuse.
211 pairings
Video conversions
Between containers, out to GIF, and out to audio or still frames.
93 pairings
Audio conversions
Music, voice notes and podcasts, lossy or lossless.
Not sure which format you want?
The guides settle the usual arguments — PNG against JPG, MP4 against MKV, MP3 against WAV — and say what each conversion costs in quality. If the file is simply too big for wherever it is going, start from the problem instead.