Tesseract vs Google Cloud Vision OCR
Pick Tesseract if you want free, open-source OCR on your own machine and you are happy to install it and tune it.
Pick Google Cloud Vision if you want an API that handles images, PDFs and handwriting and returns word positions, and you are fine paying per page after the free tier.
How the two engines differ
Tesseract is a library and command-line tool. Since version 4 it uses a neural network that reads whole lines of text. You install it, point it at a page image and pick a language. It costs nothing, and the files stay with you.
Cloud Vision is a hosted API. You send a request and get back JSON with the full text and a box around every block, paragraph and word. The text-detection feature built for documents is DOCUMENT_TEXT_DETECTION. You build any file output yourself.
Neither one gives you a finished document out of the box. Tesseract needs setup and page images. Vision needs a cloud project and code that turns JSON into something readable.
Tesseract and Google Cloud Vision compared
Checked November 2026.
| Tesseract | Google Cloud Vision | |
|---|---|---|
| What it is | Open-source OCR engine (Apache 2.0) that runs on your own machine | A Google Cloud API; you send images or PDFs and get JSON back |
| Setup | Install the engine, plus a trained-data file for each language | Google Cloud project with billing, the Vision API enabled and credentials |
| Input | Images. PDFs are usually converted to page images first | Images, PDF and TIFF. Long PDFs use asynchronous requests through a Cloud Storage bucket |
| Output | Plain text, hOCR, TSV, ALTO, PAGE, and a PDF with an invisible text layer | JSON: the full text plus pages, blocks, paragraphs and words with bounding boxes |
| Languages | More than 100 languages and 37 scripts have trained data; you pick one per run | Automatic language detection; language hints are optional |
| Handwriting | Not listed as a feature in the project README | Documented for DOCUMENT_TEXT_DETECTION, with a handwriting language hint for English |
| Cost | Free at any volume; you pay for your own compute | First 1,000 units a month free, then $1.50 per 1,000, and $0.60 per 1,000 past five million |
| Where files go | Stay on your machine | Sent to Google Cloud |
Sources: Tesseract README, Tesseract language and script table, Vision: full-text annotations, Vision: PDF and TIFF, Vision: handwriting and language hints, Vision pricing, Amazon Textract pricing.
Tesseract fits when
- Files must stay on your own machine or network.
- Your pages are clean, printed and mostly straight.
- You process a lot and want zero per-page cost.
- You want to tune segmentation and preprocessing yourself.
Cloud Vision fits when
- You need word or symbol positions as data.
- Your input is photos, mixed languages or handwriting.
- You do not want to run or scale OCR yourself.
- You already use Google Cloud.
Questions people ask
Is Google Cloud Vision more accurate than Tesseract?
It depends on the document. Clean printed pages often read well in both. Vision is documented for dense documents and handwriting; Tesseract is built for printed text and does best on clean, straight scans. Published comparisons disagree, so run both on a sample of your own files.
Is Tesseract made by Google?
Not any more. Google developed it from 2006 until August 2017. Tesseract is now an open-source project under the Apache 2.0 licence. It is a different engine from Cloud Vision.
Is Google Cloud Vision free?
It is pay-as-you-go with a free tier. The first 1,000 units each month cost nothing, then it is $1.50 per 1,000 units up to five million, and $0.60 after that. A PDF page counts as one unit, and you need a billing-enabled Google Cloud account.
How do Amazon Textract and Google Cloud Vision compare on price?
Textract lists $1.50 per 1,000 pages for the first million, with a free tier of 1,000 pages a month for three months for new AWS customers. Vision lists $1.50 per 1,000 units after 1,000 free a month, dropping to $0.60 past five million. Both return JSON rather than a document.
Which one makes a searchable PDF?
Tesseract can write a PDF with an invisible text layer. Cloud Vision returns JSON, so you build any text layer yourself.
Want text from a scan without setting up either?
FastOCR is a separate web tool: drop in an image or PDF and get text or a searchable PDF back. No install, no watermark, and no sign-up for images.
Try FastOCRLast updated November 1, 2026.