SAKUSAKU Tools
A collection of quick, handy web tools.
Images & Graphics
Image format conversion, placeholders, and PDF thumbnails.
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Image Compression
Re-encode to JPG / WebP at chosen quality to shrink size.
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Image Resize
Batch-resize by longest side / width / height with ZIP output.
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SVG Color Replace
Bulk-replace colors inside an SVG.
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Convert to PNG
Batch-convert JPG / WebP / SVG to PNG, with ZIP download.
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Convert to JPG
Batch-convert PNG / WebP / SVG to JPG, with ZIP download.
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Convert to WebP
Batch-convert PNG / JPG / SVG to WebP, with ZIP download.
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Placeholder Image
Generate placeholder images at any size.
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PDF Thumbnail
Render the first page of a PDF and check permissions.
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Background Remover
AI-powered transparent PNG. Runs in your browser, commercial use OK.
Color & Design
Accessibility checks and color tweaking.
Text & Content
For copy review and dummy text.
Code & Development
Encoding, formatting, and CMS paste cleanup.
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Regex Tester
Live regex testing with match highlighting.
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Unix Timestamp Converter
Two-way conversion between timestamps and dates (local / UTC).
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JSON Formatter & Validator
Real-time formatting with syntax highlighting.
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URL Encode / Decode
Two-way percent-encoding conversion.
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Base64 Encode / Decode
UTF-8 safe Base64 conversion in real time.
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WYSIWYG Code Cleaner
Sanitize pasted HTML for use in CMS WYSIWYG editors.
Utilities
Security and QR — the everyday handy tools.
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Password Generator
Generate 10 secure random passwords at once.
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QR Code Generator
Generate a QR from URL or text and download as PNG.
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YouTube Thumbnail
Get YouTube thumbnail URLs at all available resolutions.
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WHOIS Lookup
Look up domain registrar, expiry and name servers via RDAP.
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My IP Address
Show your IPv4 / IPv6 address with country, region, and ISP info.
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Screen Size & Resolution
View window size, screen resolution, and device pixel ratio in real time.