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File Type Checker

Find the real format of files with missing or wrong extensions via magic bytes.

Coming soon Next update Runs in your browser · No upload

We're building this tool

Like every Toolulah tool, it will run entirely in your browser without uploading your files. If you need it, press the button below — we build the most requested tools first.

It will go live at this exact address. Bookmark it.

Tools you can use right now

Loan CalculatorMonthly payment, total interest and a full repayment schedule for three loan types. Percentage CalculatorX% of Y, X as a percent of Y, and percentage increase or decrease. VAT CalculatorAdd VAT to a net amount, or work backwards from a VAT-inclusive total. D-Day CalculatorCount down to any date, or count the days since one — with milestones. World ClockLive local time in major cities, with UTC offsets and DST status. Currency ConverterDaily mid-market rates for dollars, euros, pounds, yen and more.

Files & Archives · Coming soon

Create ZIP File Coming soonBundle files and folders into a ZIP, with optional password protection. Extract ZIP Files Coming soonBrowse and extract ZIP contents, with fixes for garbled non-English filenames. Extract RAR, 7Z, TAR & GZ Coming soonOpen RAR, 7Z, TAR and GZ archives without installing any software. Create 7Z or TAR.GZ Archive Coming soonPack files and folders into a 7Z or TAR.GZ archive. Repair Corrupted ZIP Coming soonRecover the readable files from a ZIP archive that won't open. Fix Split Korean Filenames Coming soonRecombine Korean filenames that a Mac split into separate letters (NFD to NFC). Batch Rename Files Coming soonRename many files by numbering, date or find-and-replace rules and get a ZIP. Duplicate File Finder Coming soonScan a folder and list files with identical content, matched by hash. File Metadata Viewer Coming soonInspect hidden metadata in any file: photos, audio, video, documents and more.

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Tell us what you want to do. We build the most requested tools first.