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How-to Guide

Combine Document Photos into One Image for OCR

Text extraction goes wrong in the same place every time: the order of the pages. Give a tool four separate files and it either guesses where the fourth one belongs, or it processes each file as its own document and you reassemble the output by hand. A single grid with a fixed reading order removes that guesswork.

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Grouping pages into one image does not replace OCR, it feeds it better. Most extraction tools work per image, so a single composed page turns four calls into one and, more importantly, makes the sequence explicit in the pixels rather than in the file names.

Two layouts cover almost every document case. A 2×2 grid holds four small pages, which suits receipts, tickets and forms. A 1×2 grid holds two larger pages side by side, which suits invoices and contracts where the fine print matters. When precision on small print is the goal, fewer cells at higher resolution always beat more cells at lower resolution. The preparation steps that matter most are the same ones listed in our prepare screenshots for AI analysis guide.

The details that decide whether extraction succeeds: (1) straighten each page before merging, since a skewed photo degrades recognition across the whole cell, (2) crop to the paper, so the desk and the background do not consume resolution, (3) keep a gap between cells so the last line of one page is not joined to the first line of the next, (4) export at 3000px or more when the source is small print, because every character needs enough pixels to be recognised.

Then state the order when you run the extraction: a 2×2 grid with a reading order of left to right, then top to bottom. A tool that only accepts one image now has one image with a known internal order, and a tool that accepts several receives a single file whose contents you chose.

One caution: do not compress before extracting. JPG artefacts around thin characters are a common cause of a digit being read as a letter, and the error is invisible until someone pays the wrong amount. Export PNG when the document is text-heavy, and switch to JPG only if file size blocks the upload. The free plan covers PNG and JPG up to 4000px, 12 images per grid and 2 exports per day.

MergeFrame runs in the browser, so scans of invoices, identity documents or internal records are never uploaded while you build the grid. The 24-hour Pass at $3 adds unlimited exports for 24 hours, PDF and WebP output, and import of HEIC, SVG or TIFF files when your sources are not already PNG or JPG.

How to Do It: Step by Step

  1. 1

    Straighten and crop each page first

    A skewed or uncropped page costs recognition quality in every cell.

  2. 2

    Decide the reading order

    The order you will state in the prompt, before you place anything.

  3. 3

    Build the grid in MergeFrame

    2×2 for four small pages, 1×2 for two large ones, always with a gap.

  4. 4

    Export PNG at 3000px or more for small print

    Every character needs enough pixels. 4000px is the export maximum.

  5. 5

    Run the extraction and state the layout

    Name the reading order so the tool does not have to infer it.

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Frequently Asked Questions

Does merging images improve OCR accuracy?

It does not change the recognition itself, it changes the order. One image with a known reading order removes the page reassembly step and the ambiguity about which file came first.

PNG or JPG before extraction?

PNG. JPG compression creates artefacts around thin characters, which is a common source of misread digits. Use JPG only when file size blocks the upload.

How many pages per grid?

Two large or four small in practice. Beyond that each cell gets too few pixels for small print, and recognition drops more than the convenience gains.

Can I extract text from a screenshot as well as from a photo?

Yes, and screenshots behave better: they are already straight and cropped, so the cell is entirely text. Screenshots of tables and receipts are the easiest case.

What does it cost?

Free: 12 images per grid, 2 exports per day, PNG and JPG up to 4000px, no account, no watermark. The 24-hour Pass at $3 gives unlimited exports for 24 hours plus PDF and WebP output.

Related Free Tools

Free step-by-step guides from the same use case and from adjacent ones.

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