Check what a file really is from its bytes, not from the name it was given
Processed in your browser. Nothing is uploaded. Updated on 24 Oct 2026.A file type checker reads what a file is from its bytes, not its name. A JPEG saved as report.png or a download with the wrong extension is compared with the byte signatures of 36 formats, and you are told what the file really is and how the name disagrees. The file is read in your browser, never uploaded.
Press Select a file, or drop the file a portal or app refused to open.
Read the top line: it names the format from the bytes, not from the file name.
Compare Extension with MIME type; when they disagree, the page says exactly how.
Press the button under What you can do with this file to convert or open it in the right tool.
The File Analyzer exists because a site with a hundred and forty tools and no way in is harder to use than one with ten. Rather than asking you to guess which tool you want, it asks for the file and works backwards from it.
What it establishes, and how. The name and the extension come from your device. The format comes from the file's own opening bytes, matched against the signature table every format on this site is described by, which is why a JPEG named photo.png is reported as a JPEG. The MIME type follows from that verdict, with your browser's own claim shown beside it whenever the two disagree. The size is given both as a human figure and as an exact byte count, because upload portals count bytes. The magic number is printed in hex and as characters, with the offset it sits at. Dimensions are read out of the header for PNG, JPEG, GIF, BMP, WebP, TIFF, ICO, SVG, HEIC and AVIF, without ever decoding the picture, so a forty-megapixel photo is measured instantly. Metadata means EXIF, XMP, IPTC and embedded text, including the GPS position a phone writes into a photo. The hashes are SHA-256 and MD5, computed over every byte.
Anything that cannot be established is said in a sentence rather than left blank. A zip has no dimensions. A stripped JPEG has no metadata. A CSV has no magic number, because text formats do not have one. A file nobody recognises has no honest MIME type at all.
The rest of the article, and all 8 questions about File Analyzer, are on the File Analyzer page.
Drop the file on this page. Almost every binary format writes a fixed run of bytes at its start, so a PNG, a PDF, a zip or an MP4 is recognised from its contents whatever the file happens to be called. The verdict, the signature bytes behind it and the offset they sit at are all shown.
Renaming a file changes its label and nothing else. A photo saved as JPEG and later renamed to .png is still a JPEG inside, and any portal that checks properly will reject it. The analyzer reads the bytes, says which format they really are, and offers the converter that would make the name true.
Those bytes are how software recognises a format without trusting the filename. A PNG begins 89 50 4E 47, a PDF begins %PDF, a zip begins PK. Seeing them in hex proves what the file is, which matters when an upload keeps failing or when a download does not open in the program it should.
Haan. File ka type kaise pata kare ka seedha jawab yahi page hai: file daaliye aur uske pehle bytes browser mein hi padhe jaate hain. Koi software install nahi karna padta, file upload nahi hoti, aur format, size, dimensions aur hash sab ek saath dikh jaate hain.
Still stuck? Ask about File Analyzer and anybody who knows can answer. No account needed.
On the related tools: HAR Sanitizer – Remove cookies, Authorization headers and tokens from a HAR before sending it to support · Extract Videos from ZIP – Extract video files from a ZIP without unpacking the rest; nothing is uploaded.
In the collection File Converter.