Tools

Practical tools with no account required. File and text workflows favor local processing, with Japanese and English support.

What You Can Do

Count words, convert Markdown, compare text, and transform casing directly in the browser for writing and editing workflows.

Format JSON, convert Base64, inspect JWTs, parse cron expressions, and generate hashes without opening a separate desktop app.

Compress images, remove backgrounds, upscale images, create PDFs, and crop files while keeping processing on your device whenever possible.

Create QR codes, convert units, run timers, and translate time zones for small tasks that should not require an account or installation.

If you do not know the tool name, start with the outcome closest to the task you need to finish.

Measure length and reading time, transform casing, and compare revisions in one writing workflow.

Choose compression, background removal, cropping, rotation, upscaling, or PDF export for the job.

Format and convert JSON, YAML, and CSV, then separate syntax issues from schema problems.

Work with URLs, Base64, UUIDs, hashes, JWTs, and cron schedules before or after implementation.

Generate passwords, optionally check known breaches, inspect JWTs, and verify checksums.

Create QR codes, convert units, run timers, and compare time zones without creating an account.

Yuustudio tools are free to use.
User input is generally processed inside the browser.
Japanese and English pages include usage steps, FAQs, and security notes for each tool.