Built in the browser
Small tools for real tasks, built at Wataru’s Web Lab. I favor focused interfaces, local browser processing where it makes sense, and honest build notes over feature-heavy products.
Browser tool
Convert structured data between JSON, YAML, TOML, and nested Query Strings in either direction.
Useful for: Moving API payloads, configuration data, and search parameters between formats without uploading them.
Browser tool
Count words in real time, rank repeated terms, and highlight every exact occurrence in your draft.
Useful for: Reviewing repetition and word choice without uploading or saving the text.
Browser tool
Search the complete Unicode Emoji 17.0 set by name, meaning, code point, or keyword.
Useful for: Adding the right emoji to merge requests, Slack, email, release notes, and documentation in seconds.
Browser tool
Enlarge JPEG, PNG, and WebP images by 2× to 8× with Pica interpolation and light sharpening.
Useful for: Making small images larger without uploading them or generating imaginary detail with AI.
Browser tool
Turn multiline text into a polished square, portrait, or landscape image with local Canvas export.
Useful for: Creating social graphics for Twitter / X, Pinterest, Facebook, Instagram, and TikTok.
Browser tool
Remove image backgrounds and download a transparent PNG or WebP without uploading the source.
Useful for: Creating product cutouts, profile images, stickers, and transparent assets for websites.
Browser tool
Turn multiline text into a polished square, portrait, or landscape image with local Canvas export.
Useful for: Creating social graphics for Twitter / X, Pinterest, Facebook, Instagram, and TikTok.
Browser tool
Convert JPG, PNG, HEIC, and HEIF images to one or more WebP sizes without uploading them.
Useful for: Preparing phone photos and transparent images for blogs, websites, and other web projects.
Browser tool
Build a printable monthly tracker for small habits and repeatable daily actions.
Useful for: Planning a month of small actions and marking progress with checks, colors, or stickers.
Browser tool
A private, browser-based 9×9 canvas for goals, plans, and ideas.
Useful for: Expanding one central thought into eight themes and 64 practical actions or supporting ideas.