Best Browser Extensions for Extracting Text from Images
Compare Copyfish, Project Naptha and Google Lens for copying, searching and translating text in browser images, with privacy and setup guidance.
Short answer: choose Copyfish when you need to draw a region over images, video or PDFs; choose Project Naptha when you want text inside ordinary web images to become selectable; and choose Google Lens in Chrome or Firefox when searching, translating or identifying an image matters as much as copying its text. No reviewed source provides a controlled accuracy benchmark, so there is no evidence-backed universal winner.
Which extension should you use?
| Need | Best-supported starting point | What to know |
|---|---|---|
| Copy text from a chosen area in an image, video or PDF | Copyfish | Region selection, overlay results, translation and a repeat mode for subtitle regions. Its official listings say it uses OCR.Space’s API. |
| Select text directly inside a normal web image | Project Naptha | Inline I-beam selection, copy, edit and translate. The listing describes local OCR plus a remote transcription lookup for highlighted text. |
| Search, translate or identify an image with a built-in feature | Google Lens in Chrome or Firefox | Chrome sends a screenshot and page data to Google for processing. Firefox requires Google as the default search engine and is rolling the feature out gradually. |
| OCR outside a browser page | Copyfish with UI.Vision XModule | This is an optional desktop OCR workflow and requires an additional module. |
Verify the current listing for your browser before installing. Store versions and availability can change; the versions documented in the research were browser-specific snapshots, not permanent compatibility guarantees.
Copyfish: region-select OCR for images, video and PDFs
Copyfish asks you to mark the part of the page to recognize, then shows extracted text as an overlay. Its Chrome and Firefox descriptions explicitly cover photographs, charts, diagrams, screenshots, comics, memes, video subtitles and PDFs. The developer’s repository lists Chrome, Edge and Firefox support. Source and browser support.
How to copy text with Copyfish
- Install Copyfish from the Chrome Web Store or Firefox Add-ons.
- Open the page containing the image, video frame or PDF.
- Choose the Copyfish toolbar button and drag around only the text you need.
- Review the overlay, then copy the recognized text.
- Use its translation control when you need a translated result. For subtitles or another repeated region, use the repeat function.
Copyfish’s normal workflow uses the OCR.Space free OCR API, according to its store listings. Do not describe that path as local OCR. The Firefox listing separately documents optional desktop OCR through the free UI.Vision XModule; OCR.Space’s setup page describes the local Windows and Mac option through UI.Vision XModules2. OCR.Space setup details.
When Copyfish works best
- The text is confined to a known rectangle.
- You need the same subtitle or caption area read repeatedly.
- The source is a PDF or video frame rather than a simple web image.
- You want an overlay and an explicit OCR action instead of selecting text inline.
Project Naptha: select text in place
Project Naptha is designed for ordinary images on the web. Move over an image until the cursor becomes an I-beam, highlight the detected words, and use Ctrl+C to copy. The listing also describes editing and translation.
Its disclosure says OCR and text detection happen locally on the computer. When text is highlighted, it also checks a remote server for a public transcription using a cryptographic hash of the image URL; the disclosure says cookies and user tokens are excluded. This is a different data path from Copyfish’s stated OCR.Space API workflow.
Project Naptha workflow
- Install the extension in Chrome.
- Open a page with a text-bearing image.
- Hover over the image and wait for detected text to become selectable.
- Drag across the words and press Ctrl+C (or use the context menu).
- Translate or edit the selection if required.
Naptha’s documentation and listing focus on web images. They do not establish the same explicit video and PDF coverage claimed by Copyfish.
Google Lens in Chrome and Firefox
Chrome
Chrome’s built-in Lens feature can search an entire page, an individual image or a selected region. It is useful when the goal is to identify an object, find similar images, translate text or search with copied words. Google states: “When you use Lens to search web page content in Chrome, a screenshot of the page and page data will be sent to Google.” The data is processed and temporarily stored for that query. Chrome Lens documentation.
- Right-click the page or image and choose the Lens search option.
- Drag over the relevant region if you do not want to search the entire page.
- Use Lens results to copy, translate or search the detected text.
Firefox
Mozilla documents right-clicking an image and choosing “Search image with Google Lens.” You can select regions, identify objects or products, translate image text, copy or highlight text, and search with selected text. Google must be the default search engine, and Mozilla says the feature is gradually rolling out, so it may not appear in every Firefox installation. Mozilla’s Firefox Lens guide.
Privacy and data-path checklist
| Tool | Documented processing path | Question to ask before using confidential images |
|---|---|---|
| Copyfish | Uses OCR.Space’s free OCR API; optional desktop OCR uses UI.Vision XModule. | May the selected image region be sent to an OCR service? |
| Project Naptha | OCR and detection locally; highlighted text can trigger a remote lookup using a hashed image URL, excluding cookies and user tokens. | Is a URL-derived lookup acceptable for this image? |
| Google Lens | Chrome sends a screenshot and page data to Google for processing and temporary storage for the query. | Can the page screenshot and its data leave the device? |
For source code, credentials, personal records or unreleased designs, check your organization’s policy before using any cloud OCR or Lens workflow. The sources reviewed do not establish that one option is safest for every situation.
Improve OCR results
- Capture only the text region, excluding decorative backgrounds.
- Zoom the page before selecting small text, while keeping the full characters inside the selection.
- Use the highest-resolution source available; a compressed thumbnail gives every OCR engine less information.
- For subtitles, pause the video on a sharp frame and select the same region consistently.
- Check punctuation, similar characters such as O/0 and I/1, line breaks and reading order manually.
- For multi-column pages, process one column at a time when the result mixes reading order.
- Try a second workflow for difficult scripts or stylized fonts. Available sources do not support a universal accuracy ranking.
Common problems and fixes
| Problem | Likely cause | Fix |
|---|---|---|
| No text is detected | Low resolution, unusual font, animation or an incomplete selection. | Zoom in, pause the frame, select a tighter region and retry with a clearer source. |
| Copyfish works on images but not a desktop window | Normal browser OCR and desktop OCR are separate workflows. | Use an image or PDF in the browser, or install the optional UI.Vision XModule for documented desktop OCR. |
| Copyfish result is unavailable | The selected region could not be processed by its OCR.Space API path, or the page blocked the interaction. | Retry with a smaller region, save the image and open it in a normal tab, or check the extension’s current service status and permissions. |
| Project Naptha has no I-beam | The image may not be a normal web image, detection may not have completed, or the text is too small. | Wait for detection, refresh the page, enlarge the image and try a different image-focused workflow. |
| Lens is missing in Firefox | Google is not the default search engine or the feature has not reached that installation. | Set Google as default and update Firefox; if it still does not appear, use Chrome Lens or an extension. |
| Text order is scrambled | Columns, labels or mixed directions confuse region detection. | Select each logical block separately and reconstruct the order during review. |
| Translation is wrong | OCR errors are being translated as if they were source text. | Correct the copied text first, then translate; compare against the image. |
Performance, reliability and cost considerations
- Latency: local detection can feel immediate, while API-backed OCR and Lens processing depend on network and service response time.
- Reliability: browser updates, store availability, page permissions and remote service changes can alter behavior. Keep a fallback method for recurring workflows.
- Cost: the reviewed extensions and browser features are described as free, but API limits, service policies or optional desktop modules can change. Confirm current terms in the official listing.
- Repeat jobs: use Copyfish’s repeat function for a stable subtitle region, or automate image capture separately before OCR when processing many pages.
Or skip the browser setup
If you first need a clean image of a web page, ScreenshotNeo can return a screenshot or PDF from one GET request. It is a capture service, so you still run OCR on the resulting image with the extension or OCR tool you choose.
ScreenshotNeo removes cookie and consent banners, newsletter popups and chat widgets before capture. Bot checks, blank pages, failed loads, timeouts and cache hits are not billed, and the response identifies the page verdict and billing status. Its MCP server lets Claude, Cursor and other MCP clients call take_screenshot, get_page_info and capture_pdf. The Free plan includes 1,000 shots per month without a card; paid plans start at $5 for 3,000 shots. See the ScreenshotNeo documentation.
curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://stripe.com -o shot.webpimport requests
r = requests.get("https://api.screenshotneo.com/v1/shot", params={"access_key": "YOUR_API_KEY", "url": "https://stripe.com"}, timeout=90)
open("shot.webp", "wb").write(r.content)const q = new URLSearchParams({ access_key: 'YOUR_API_KEY', url: 'https://stripe.com' });
const res = await fetch(`https://api.screenshotneo.com/v1/shot?${q}`);Create a free ScreenshotNeo account with 1,000 screenshots a month and no card.
FAQ
Can I copy text from any image?
No. Results depend on resolution, contrast, font, layout and language. Always proofread names, numbers and punctuation.
Which extension has the highest OCR accuracy?
The reviewed official sources provide capability descriptions, not controlled comparative tests. Choose by workflow and verify it on your own images.
Is Project Naptha completely offline?
Its listing says OCR and detection happen locally, but also describes a remote transcription lookup when text is highlighted.
Does Firefox include Google Lens for everyone?
No. Mozilla documents a gradual rollout and requires Google to be the default search engine.
Can ScreenshotNeo extract text from an image?
ScreenshotNeo captures webpages and returns PNG, JPEG, WebP or PDF. Use an OCR extension or OCR service on the captured file.
