LensUp — Free Online Document Scanner

Free in-browser document scanner: photo → clean PDF. Crop, fix perspective, add an optional watermark or signature, and compress. No upload or sign-up.

View on lensup.ai

Documentation

A phone photo,

returned as a clean sheet.

Crop, adjust contrast, and straighten by hand when you need to — then export a printable A4 PDF, or compress toward the size a form asks for. Files never leave your device.

Take a photo or choose filesAll 11 tools

No upload· on-deviceFree· no watermark14 languages

RestoreClear

Take photo or choose image

Drop to add

Scan effect

Grayscale White document De-shadow Black & white Color Fade colored pen

Tap a page to crop, rotate or fix perspective. Drag ⠿ to reorder.

Export options

Paper size

A4 Letter Original

Layout

Single 2-up 4-up ID card

ID card: places the first two pages as front & back at ID-1 size on one A4 sheet. Use Edit to crop or align the four corners.

Compress to

No limit200 KB500 KB1 MB

Physical output size

WidthHeightmm

Optional. Keeps the image ratio and never exceeds the page.

WatermarkOff

Watermark textWatermark image

An image takes priority when text and image are both set.

Opacity

30%

Size

8%

Rotation

45°

Repeat watermarkClear

Signature / stampOff

Signature or stamp image

A transparent PNG gives the cleanest result.

Opacity

100%

Size

22%

PositionTop leftTop rightBottom leftBottom rightCenter

All pagesPage

Clear

Export PDF

🖨️Print📤Share

🔒 Everything runs in your browser — your files are never uploaded.

Popular tools

Scan to PDFDocument scanner: crop a photo, adjust contrast, then make a printable PDF.Passport photo35 × 45 mm crop, white/blue/red, A4 sheet.Compress to a limitToward 200 KB — best effort, real size shown.

All tools in one place

Every tool opens focused, with the same crop-mark editor. Nothing is uploaded.

Scan & clean

Scan to PDFDocument scanner: crop a photo, adjust contrast, then make a printable PDF.Cam scannerUse your camera as a document scanner — no app.Even out lightingReduce uneven light so the page reads flatter.Fade pen marksSoften coloured pen on printed worksheets.Straighten by handDrag the four corners to flatten a skewed shot.

Size & convert

Compress to a limitToward 200 KB — best effort, real size shown.Increase size in KBMeet a form’s minimum file-size floor.Resize in cmSet exact centimetres at the DPI you choose.JPEG → JPGRe-export with the extension strict forms accept.

ID & forms

Passport photoNew35 × 45 mm crop, white/blue/red, A4 sheet.ID card copyFront + back at real size on one A4 sheet.

How to scan a document to PDF

Photograph it, crop and straighten, choose a scan effect, then export — you get a clean scanned PDF, no hardware needed.

  1. 1

Capture: photograph the document

Photograph any paper document or add images — multiple pages merge into one PDF in order. 2. 2

Refine the scan in your browser

Crop, straighten, fix perspective, and pick a scan effect — right in your browser. 3. 3

Export a printable scanned PDF

Save a clean, printable scanned PDF, or compress it toward an upload limit.

Made for real documents

Crop, adjust contrast, and straighten by hand when you need to — then export a printable A4 PDF, or compress toward the size a form asks for. Files never leave your device.

  • Real-scan quality

De-shadow, perspective correction and document whitening turn a phone photograph into a proper scan — a real document scanner, no hardware needed.

  • Built for upload limits

Aim for an upload limit such as 200 KB, or lay out 2-up and ID-card copies for printing.

  • Yours, private

Every file-processing step runs in your browser — no upload of your files and no account needed.

  • Free, everywhere

Unlimited, no watermark, works on phone, tablet and computer, in your language.

Who uses LensUp?

  • Government and job applications

Need to compress an image to 200 KB for an application portal? LensUp works toward that upload limit and warns you when the target cannot be reached.

  • Students and teachers

Scan worksheets, straighten photographed pages, and fade colored pen marks while keeping dark printed text visible.

  • ID and paperwork errands

Make an ID card copy with the front and back on one A4 page at ID-1 size. Use Edit to crop or align each side manually.

  • Receipts and records

Photograph receipts or paper records, arrange the pages, and merge them into one PDF in the order you choose.

Sources and technical references

These standards and browser references support the file-handling, image-processing and ID-card format statements above.

  1. W3C File API
    Defines how a web application can access files that a person explicitly selects.
  2. MDN Canvas API
    Documents browser-side drawing and photo manipulation used for local scan effects.
  3. ISO/IEC 7810:2019
    Defines physical characteristics for identification-card formats, including the ID-1 format used by the copy layout.

More free document tools →

Document scanner FAQ

How do I scan a document to PDF without a scanner?

Photograph it, crop and straighten, choose a scan effect, then export — you get a clean scanned PDF, no hardware needed.

Is it really free and private?

Yes. Unlimited, no watermark, no sign-up, and every step runs locally in your browser — files are never uploaded.

Can I compress a PDF to 200 KB or another upload limit?

Choose a target such as 200 KB or 500 KB. LensUp tries to stay below it, but extreme targets may still return the smallest possible file with a warning.

How do I scan a document to PDF without an app?

Photograph the page or choose an image, crop and straighten it, pick a scan effect, then export a scanned PDF. Everything runs in your browser, with no app or upload.

How do I remove the shadow from a document photo?

Use De-shadow to remove shadow from the scan and even out the lighting, then use Edit to crop or correct perspective. Everything stays in your browser.

Open the de-shadow toolCan I scan an ID card front and back onto one page?

Choose the ID card layout to place the first two pages as front and back at ID-1 size on one A4 sheet. Use Edit to crop or align the four corners manually.

Open the ID card copy tool

Cancel

EditCrop

Done

Drag the corners to select the page

⌗Crop◇Perspective

↶Rotate left↷Rotate right↩Undo↺Reset◉Compare

Ask LensUp

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