Free File Tools
Free file utility tools to convert audio and video formats, clean and rename messy file names, and check or convert file sizes without uploading anything.
How to choose the right tool
File tools help rename, size, convert, or prepare files for sharing, storage, and document workflows.
File-size tools may use decimal or binary byte units. Converter support varies by tool and browser memory.
Choose by need
- Use file-name tools when names need cleaning, normalising, or batch-safe formatting.
- Use size tools when comparing bytes, KB, MB, GB, and download or storage limits.
- Use media and document converters when changing audio, video, image, PDF, or spreadsheet formats.
Common tasks
- Clean file names before uploading a folder.
- Convert a file size between MB and GB.
- Extract audio from a video or prepare a document for sharing.
Choose a tool and get an instant result
BlinkCalc tools are designed to be fast, practical, privacy-conscious, and easy to understand. Many tools process inputs directly in your browser; tools that need a remote request explain that processing on their page.
File Name Cleaner
Clean, sanitize, and normalize messy file names.
File Size Calculator
Convert file sizes between Bytes, KB, MB, GB, and TB using the binary 1024-byte system.
MP4 ↔ MP3 Converter
Extract MP3 audio from MP4 video, or wrap an MP3 into an MP4 container.
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Health
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Converters
Convert length, weight, temperature, area, volume, speed, time, energy, data storage, and other common measurement units online.
Date & Time
Free date and time tools to convert Unix timestamps, calculate the difference between dates, count down to a deadline, switch time zones, and convert military time.
Everyday
Practical everyday calculators for paint coverage, concrete and gravel volumes, electricity costs, wind chill, heat index, fuel cost, ABV, and more.
Frequently asked questions
Are these file tools really free?
Yes. Renaming, sizing, and converting files all run free, in your browser, with no signup.
Do you upload my files?
No. Every file tool runs locally. Your files never leave your device.
How large a file can I process?
The practical limit is your device's memory. Multi-gigabyte files may need a desktop tool; everything smaller works comfortably.