Answers
The questions a converter leaves you to answer
Why a file was rejected. What it really is, read from its bytes rather than its name. Whether it is safe to send. These are the tools for the part of the job that is not a conversion.
10 of them work today; the rest are listed without a link until they do.
Checks and odd jobs
The questions a converter normally leaves you to answer yourself.
- Song Key & BPM Finder The key, Camelot code and tempo of any song, with the working shown.
- Identify a File What a file really is, read from its bytes rather than its name.
- Reduce File Size Name the size limit; get the best-looking photo, video or audio under it.
- Photo Size Checker KB, pixels, DPI and print size, checked against passport, visa and exam rules.
- Convert a Folder Soon Convert every image in a folder and write the results back beside them.
- Rename Photos by Date Rename photos by the date they were taken, read from inside each file.
- Find Duplicate Photos Find the same photo saved twice, even resized, recompressed or in another format.
- Blur an Image Blur, pixelate or black out faces, names and numbers in a photo or screenshot.
- Chain Tools Together Soon Run several tools on a batch in one pass: strip, crop, then shrink.
- Photo Metadata Viewer See the location, date, device and edits hidden in a photo before you share it.
- Redact a Screenshot Find and black out emails, card numbers, keys and passwords in a screenshot.
- Compare Two Images A similarity score and a map of exactly where two pictures differ.
- What’s Using My Space Soon Which files and formats are eating a folder, and what you’d get back.
- Watch It Not Upload Soon Convert a file while the browser’s own network log watches.
What you can do today
The same problems, solved with the tools that are already working.
- Post a long video on WhatsApp Status A long video cut into numbered parts that each fit in one status, posted in order.
- Fix subtitles that are out of sync A subtitle file whose lines appear when the words are spoken, from the first scene to the last.
- Make a round profile picture A circular PNG of your face or logo, with clear corners, at the size the site wants.
- Make a favicon for your site The small icon in the browser tab, on the phone home screen, and in the bookmark list.
- Split a long recording into parts One long file turned into pieces you can send, publish or hand around.
- Your video is too big for WhatsApp A clip that sends as a video, not as a link or a file.
Questions
How do I find out what a file really is?
Use Identify a File. It reads the bytes every format starts or ends with, so it tells you what the file is whatever its name says, and gives you a correctly named copy when the extension is wrong or missing.
How can I tell whether two images are the same?
Compare Two Images checks whether the files are identical, then whether every pixel matches, and if not, measures how similar they look and maps exactly where they differ.
Why are some tools marked “Soon”?
They are listed without a link until they actually work. A page that looks like a tool and does nothing wastes your time, so we would rather show you what is coming than pretend.
What can I use for the rest in the meantime?
The common fixes cover many of the problems these tools are meant to answer, using the converters and cleaners that already work.