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PDF conversion changes a source file into a PDF, or changes a PDF into another format. Choose the tool by the input you have and the result you need. Combining existing PDFs, extracting pages and recognizing text in a scan are different jobs; a converter does not necessarily do all of them.

Start with the PDF tools directory, but decide the job before selecting a tool. A readable file is not automatically editable, searchable, accessible or suitable for a formal submission.

Match the tool to the source and the task

The Skyhoora directory lists image, text and HTML creation tools alongside PDF merging and page extraction. It is not a promise of Word-to-PDF conversion, secure redaction, signatures or OCR. Use an application’s own PDF export when it has the editable document you want to preserve.

Keep the editable source when you have one

If you wrote a document in a word processor, keep that original and export a PDF copy for distribution. Taking screenshots first can turn readable text into pictures and make later corrections harder. Conversion cannot recover detail that was absent from the source.

Example: a bundle of photographed receipts needs clear images in the correct order. A written proposal needs a checked export from its authoring application. Both can end as PDFs, but the preparation is different. These are illustrative scenarios, not claimed test results.

For photographs, follow the image-to-PDF guide for the actual queue, page-size and fit controls. For a web-style layout, use the HTML-to-PDF guide. This page helps choose the workflow rather than repeat those instructions.

Decide the recipient’s requirements before exporting

• Paper and orientation: check whether A4, Letter, portrait or landscape is required. A PDF can display on screen yet print awkwardly.
• File-size limit: find the actual upload limit. There is no universal compression setting for every scan.
• Reading order: remove unwanted files and arrange the source before conversion. Confirm the exported order afterward.
• Text and accessibility: ask whether the recipient needs searchable text or an accessible tagged document. Do not assume a lightweight converter supplies either.
• Special features: signatures, interactive forms, reliable redaction and professional print output need an appropriate specialist workflow.

Check quality rather than only the file extension

Open the exported file and look at small text, page edges, tables and photographs at a normal reading size. A smaller file is not a useful improvement if an invoice total or a caption disappears. If an image-based PDF looks blurry, return to the original scan rather than repeatedly recompressing the PDF.

Try selecting a few words if selectable text is important. If only the whole page behaves as an image, the conversion did not provide a text layer. OCR can help recognize words, but its result still needs checking; it does not guarantee correct numbers or names.

Use a cautious workflow for sensitive documents

The inspected image-to-PDF conversion path builds the file in the browser. That observation is not a sitewide privacy or security audit. Different tools can process inputs differently, and a website can load third-party scripts. For IDs, health records, confidential client files or documents with binding requirements, use your organization’s approved offline or managed process.

Review the PDF in its real destination

1. Keep an untouched source copy and create a clearly named export.
2. Check page count, order, orientation, margins and completeness.
3. Inspect the first and last pages and any dense text or tables.
4. Confirm file size and required text/accessibility features.
5. Open it in the intended viewer or submission system before sending it.

Only call the conversion finished when the recipient can use the result for the task. A successful download alone is not that check.

To convert images to one PDF, upload supported files, put them in reading order, choose a page size and layout, then export and inspect the result. Skyhoora’s Image to PDF Converter accepts JPG, PNG and WebP images and lets you arrange them before conversion.

This is useful for a receipt bundle, photographed notes, scanned pages or a small portfolio. Conversion places an image on each PDF page. It does not recognize the words in a photograph or turn them into searchable, selectable text; that requires OCR.

Prepare the images first

Choose the clearest original files. Crop unnecessary background and rotate sideways scans before adding them. Keep a separate copy of the originals so you can correct a page without repeatedly compressing an already compressed image.

The converter accepts JPG/JPEG, PNG and WebP, with a 25 MB limit per file. A phone photo saved as HEIC is not one of these supported inputs: export a compatible copy first. Renaming a file extension does not convert the image format.

Combine images into a PDF, step by step

1. Add the files. Open the converter and select the images you want to include. Start with a small batch if your phone has limited memory.
2. Arrange the pages. Use the Up and Down controls in the queue, or remove an unwanted file. The displayed image order determines the PDF page order.
3. Choose the paper size. Use A4 or Letter for documents intended for printing or formal submission. Check the recipient’s requirements rather than assuming one size is universal.
4. Set orientation, margins and fit. Portrait suits most receipts and document scans; landscape can suit a wide photograph. Start with normal margins and Contain to keep the complete image visible.
5. Convert and download. Keep the page open while the browser builds the file. Open the downloaded PDF and review every page before sharing it.

Choose clear images→Arrange pages→Set layout→Export PDF→Inspect every page

Choose a layout that preserves the content

Use Auto page size cautiously. The current converter’s Auto calculation uses image pixel dimensions as PDF millimetres, so it can create an unexpectedly large physical page. A4 or Letter is a more predictable choice for printing. The Original fit option can also alter proportions when both dimensions are constrained; Contain is the safer starting point.

Example: For three photographed receipts, arrange the oldest first, use portrait A4 or Letter with Contain, and confirm that all three totals and dates remain readable. This is a suggested workflow, not a claimed test result.

Balance sharpness and file size

A PDF cannot recover detail missing from a blurry source. Small text needs enough pixels to remain readable when the page is viewed normally. Check the downloaded PDF, not just the image thumbnail in the queue.

The converter has no compression-quality slider. Its current export path uses PNG for PNG sources and JPEG encoding for other supported images, so do not assume conversion is lossless. If the recipient imposes a size limit, try a copy of the sources through the Image Compressor before conversion, then compare text and fine detail. Do not reduce dimensions simply to chase a smaller file.

Privacy and mobile considerations

The inspected conversion code reads selected images in the browser and builds the PDF locally; it does not include an image-upload request in that conversion path. That is not a complete privacy or security audit of the website, which also loads third-party scripts. For confidential IDs, medical records or sensitive business documents, use an approved offline workflow instead of relying on a general online-tool claim.

On mobile, large camera photos can use substantial browser memory. If conversion stalls, reduce the batch, close unused tabs or use a desktop browser. Keep the converter visible until it finishes, and check your browser’s Downloads or your phone’s Files app for the result. The precise save location depends on the browser and device.

Common problems and what to check

• A file is rejected: check its actual format and the 25 MB per-file limit. Export a supported copy rather than changing its extension.
• A total or signature disappears: switch from Cover to Contain and review margins.
• A page looks stretched: use Contain rather than Original, and verify the source aspect ratio.
• Pages are out of order: correct the queue with Up/Down, then export again. Do not rely on filename sorting alone.
• Text is blurry: start with a sharper source or less aggressive pre-compression. Enlarging a low-resolution scan cannot restore detail.
• The PDF is too large: optimize copies of oversized sources and retest readability. There is no universal quality setting for every scan.

Before you send the PDF

Confirm page count and order, open the first and last page, check small text and page edges, and verify the final file size against the recipient’s limit. Use a descriptive filename such as receipts-september.pdf. If you need to convert a different kind of source rather than combine images, the PDF converter guide explains the surrounding workflow.

Implementation reference: the converter uses jsPDF to create the PDF. Its output should be checked in the viewer or submission system where it will actually be used.