Useful tools, with visible limits.

These browser tools prepare images, check and convert data, count and compare text, calculate checksums, create QR codes and generate printable paper. Files and text are processed on your device without an account or server upload. Results depend on browser support and your chosen settings. Keep originals and review generated files before using them.

Choose a tool for your task

Start with the result you need. Keep your original and check the generated copy before using it elsewhere.

  • Image fitGIF compressorVideo compressor

    Prepare still images, animated GIFs or videos for size limits. Compare the copy and test playback; video codecs depend on your browser. Meeting a technical limit does not guarantee an application will be accepted.

  • CSV checkJSON formatter

    Check a table before importing it, or inspect structured JSON. Review warnings and keep identifiers as text. Choose CSV edits explicitly; JSON formatting preserves number tokens rather than converting them into JavaScript numbers.

  • Text count & cleanCompare textHash calculator

    Count or clean text, compare changed lines, or compare a file with a trusted checksum. Line comparison and optional whitespace matching are different from checking raw file bytes.

  • Base64 converter

    Represent text or binary bytes as Base64, or recover bytes from an encoded value. Base64 is an encoding, not encryption; it does not hide private information.

  • Paper studioQR code maker

    Generate printable SVG pages or QR images. Print paper at actual size and check the 50 mm ruler. Test a QR download with the scanner you plan to use.

Operator: Lee WonHyuck