Supported formats

Each note is written beside the parser it describes. Open one to read it whole.

• JPEG10 notesMetadata lives in APP segments before the compressed image data, so cleaning and editing rewrite only those segments.Read all 10
• PNG8 notesText chunks (tEXt/zTXt/iTXt), tIME and eXIf are dropped; IDAT pixel data is copied unchanged.Read all 8
• WebP7 notesEXIF, XMP and ICCP are separate RIFF chunks; removing them leaves the VP8/VP8L bitstream untouched.Read all 7
• HEIC/HEIF7 notesMetadata lives in the file item store: EXIF and XMP are items, and removing one means rebuilding the table of byte offsets that says where every item…Read all 7
• AVIF3 notesAVIF is the same container as HEIC with a different codec inside, and one implementation covers both — checked against files from more than one…Read all 3
• MP45 notesOnly the container is rewritten. The encoded video and audio are never re-encoded, so there is no quality loss and no long processing wait.Read all 5
• QuickTime MOV3 notesQuickTime files use the same box structure as MP4 and are handled identically.Read all 3
• WebM4 notesTags, Title, MuxingApp, WritingApp, DateUTC and SegmentUID are overwritten with EBML Void elements.Read all 4
• PDF10 notesThe document information dictionary (title, author, creator, producing software, dates) and the XMP packet are both read, and both are removed by a…Read all 10
• MP37 notesMetadata sits in a tag block before the audio and a pile of smaller ones after it — ID3v1, APEv2, Lyrics3, TAG+.Read all 7
• WAV7 notesA WAV is a RIFF file: the audio is one chunk and the metadata sits in others beside it, so cleaning copies the samples across untouched.Read all 7
• M4A5 notesAn M4A is an MP4 whose tracks are sound, so the container work is the same: the encoded audio is copied through untouched and only the metadata boxes…Read all 5

One card per format. Drag the strip, swipe it, or use the arrow keys once it has focus.

Writable fields by format

How many fields the editor can write into each format. The keys themselves are one click away, because the count is the part most people came for.

Writable fields

These are the metadata fields the editor can write, each backed by a real encoder that produces a valid tag. Fields not listed here cannot be written by this build, and the interface does not offer them.

Conversion

27 conversions, every one of them run in a browser against a real file of that format before it was listed here — the file is named in the last column. Conversion happens in your browser like everything else: the codecs are served from this site, fetched only when a conversion needs one, and the size below is what that costs the first time.

What is not offered, and why

Video

Video conversion is not in this build. The only browser tool that does it downloads about thirty megabytes before it starts and runs out of memory on a phone, which is worse than not offering it. Reading, cleaning and editing a video works as it always has.

Anything into HEIC

Converting other image formats into HEIC encoding is not offered here because HEVC encoders are patent-encumbered, which is a different problem from a hard one, and a file almost nothing outside Apple will open is a poor thing to convert to in any case. Existing HEIC files can be inspected, cleaned, edited losslessly or converted out to JPEG, PNG, WebP, AVIF or PDF.

Anything into a document other than PDF

A picture can be wrapped in a PDF because a PDF can carry a JPEG exactly as it stands, losing nothing. Writing a Word or Pages file means writing an office format, which is a different product rather than a missing feature.

A PDF with more than one page

Only the first page is converted, because the output is a single picture. A document with more pages says so before you start, and says how many are being left behind.

An encrypted or password-protected PDF

A document that will not open without a password cannot be rendered, and this build does not ask for one. Remove the protection in the application that applied it, then convert the result.

Not supported yet

GIF and TIFF are recognised by the detector but cannot yet be read, so a file in one of them is declined by name rather than accepted and silently mishandled. Formats absent from this page altogether — AVI, MKV, FLAC and OGG among them — have no reader here at all. The engine is built around per-format modules behind a shared interface, so adding one is a matter of writing its parser rather than reworking the application; this list is generated from the same table as everything above, which is why it shrinks on its own when a parser lands.

Common questions