Acknowledgements & Open Source Credits
Utoline is built almost entirely from first principles — most tools run on nothing but native browser APIs (Canvas, Web Crypto, Intl, Clipboard). Two categories of tool load a small, well-established open-source library to do something that genuinely deserves a dedicated, battle-tested implementation rather than a reinvented one. We’re glad to credit them here.
Libraries used at runtime
pdf-lib
Powers PDF Merge, PDF Split & Page Extractor, and PDF Rotate. A pure JavaScript library for creating and modifying PDF documents, used under the MIT License.
pdf-lib.js.orgqrcode.js
Powers the QR Code Generator, implementing the QR error-correction algorithm correctly so generated codes actually scan. Used under the MIT License.
github.com/davidshimjs/qrcodejsTypography
Manrope
Display and heading typeface, designed by Mikhail Sharanda. Licensed under the SIL Open Font License, served via Google Fonts.
fonts.google.com/specimen/ManropeInter
Body typeface, designed by Rasmus Andersson. Licensed under the SIL Open Font License, served via Google Fonts.
fonts.google.com/specimen/InterEverything else
All calculators, converters, text tools, developer tools, image tools (compression, resizing, cropping and format conversion), security tools and SEO generators are implemented directly against standard browser APIs, with no third-party runtime dependency — see each tool’s page for exactly how it works.
Site design, copy, tool logic and architecture are original to this project.