--- title: "How to Build a Browser-Based PDF OCR to Text Converter Using JavaScript" url: https://daily.dev/posts/how-to-build-a-browser-based-pdf-ocr-to-text-converter-using-javascript-h9luff8eo source_url: https://www.freecodecamp.org/news/build-pdf-ocr-to-text-converter-javascript type: article source: "freeCodeCamp" author: "AllInOneTools" published: 2026-07-07T19:08:51.777Z updated: 2026-07-08T16:00:13.881Z tags: ["machine-learning", "javascript"] reading_time: 21 upvotes: 3 comments: 2 language: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # How to Build a Browser-Based PDF OCR to Text Converter Using JavaScript **[freeCodeCamp](https://daily.dev/sources/freecodecamp)** · [@allinonetools](https://daily.dev/allinonetools) · 21 min read · 3 upvotes · 2 comments ## Summary A step-by-step guide to building a browser-based PDF OCR tool using JavaScript, PDF.js, and Tesseract.js. Covers the full workflow: uploading PDFs, rendering page previews, configuring OCR settings (language, accuracy mode, image enhancement), extracting text page by page, tracking progress, reviewing confidence scores, and exporting results as TXT or JSON. All processing runs locally in the browser, so documents never leave the user's device. Includes performance tips and common mistakes to avoid. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Community discussion Top comments from developers on daily.dev. **@allinonetools** · 2 upvotes > Hope this helps anyone looking to build a privacy-first OCR tool. Everything runs in the browser, so your PDFs never leave your device—that was one of my main goals with this project. ## Similar posts on daily.dev - [How to Build a Browser-Based PDF Analyzer Using JavaScript](https://daily.dev/posts/how-to-build-a-browser-based-pdf-analyzer-using-javascript-dhrefkagw) · freeCodeCamp · 3 upvotes · 0 comments - [How to Build a Browser-Based PDF Image Extractor Using JavaScript](https://daily.dev/posts/how-to-build-a-browser-based-pdf-image-extractor-using-javascript-pf87bj3dy) · freeCodeCamp · 2 upvotes · 0 comments - [How to Build a Browser-Based PDF to Image Converter Using JavaScript](https://daily.dev/posts/how-to-build-a-browser-based-pdf-to-image-converter-using-javascript-ixeedosyr) · freeCodeCamp · 14 upvotes · 0 comments --- Tags: [#machine-learning](https://daily.dev/tags/machine-learning), [#javascript](https://daily.dev/tags/javascript) [View this post on daily.dev](https://daily.dev/posts/how-to-build-a-browser-based-pdf-ocr-to-text-converter-using-javascript-h9luff8eo)