Most flatbed scanners, multifunction printers, and mobile scanning apps default to JPG or PNG output rather than producing a PDF directly, which means the moment you actually need to file the document, email it to an accountant, or upload it to a portal that requires PDF, you have an awkward extra step.
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Consumer flatbed scanners (Canon CanoScan, Epson Perfection, HP ScanJet) and all-in-one printer-scanners save scanned output in several formats depending on the bundled software. Windows Fax and Scan defaults to TIFF or PNG. Many scanner applications offer JPG as an alternative alongside TIFF. Epson Scan 2 and Canon IJ Scan Utility both offer JPG and PDF as direct save options, but the built-in PDF function in scanner software often produces one-page PDFs per scan rather than combining multiple pages automatically. If you scan five pages and the scanner software creates five separate PDF files, converting them via FixTools as a batch and using the PDF Merger is more flexible and predictable than relying on the scanner's built-in combine feature, which varies in quality and reliability across scanner brands, driver versions, and operating systems.
Scan resolution is the single biggest factor in output quality. 150 DPI is the minimum acceptable resolution for filing documents you only need to read on screen. At 150 DPI, a standard A4 page scans to 1240 x 1754 pixels, large enough to read in a PDF viewer but not suitable for printing. 300 DPI is the accepted standard for document archiving: an A4 page at 300 DPI scans to 2480 x 3508 pixels and text at 12 pt remains legible when printed at full size. For legal documents, contracts, or anything you may need to print at high quality in the future, 300 DPI is the floor. 600 DPI (4960 x 7016 pixels on A4) is reserved for archiving documents with fine print, maps, technical drawings, or historical records where fine detail matters. A 600 DPI A4 TIFF can be 25 to 60 MB per page; converting to PDF without recompression reduces this only marginally because the pixel data is the bulk of the file.
Multi-page scan assembly is where browser-based tools provide the most practical benefit over scanner software. Most flatbed scanners require you to scan one page at a time, lifting the lid and repositioning each sheet. After scanning ten pages individually, you have ten separate files in your Downloads folder. Upload all ten to FixTools in a single session, drag the thumbnails into reading order (page 1 to page 10), and click Convert. FixTools creates a single ten-page PDF in one operation. If you later find a page is missing or was scanned upside down, scan just that page and use the FixTools PDF Merger to insert it at the correct position in the assembled document. This non-destructive workflow means individual errors do not require re-scanning the entire bundle from scratch.
Sheet-fed scanners and document feeders speed multi-page scanning significantly, but they introduce their own pitfalls: the feeder occasionally double-feeds (pulls two pages through at once, skipping one), skews pages slightly, or jams on staples and creases. After a long batch scan, always count the output files against the original page count before converting to PDF, a 47-page document should produce 47 image files, and any discrepancy means re-scanning a section. For documents with a mix of single-sided and double-sided pages, scan in duplex mode and review the output for blank pages, which can be deleted before upload. FixTools simply renders whatever pages you supply, so quality control before upload is the most efficient way to avoid having to rebuild the PDF later.
Upload your scanned JPG or PNG images and convert them to PDF. For multi-page documents, upload all scanned pages and arrange them in order before converting.
Step-by-step guide to convert a scanned image to pdf:
Scan your document
Use your flatbed scanner, multifunction printer, or mobile scanning app to capture each page of the document at 300 DPI. Save the output as JPG for compact files or PNG for lossless quality. Place pages on the platen squarely and close the lid to prevent ambient light from washing out the edges.
Upload the scanned image
Open the FixTools Image to PDF converter and drag your scanned files into the drop zone, or click to browse. The converter accepts JPG, PNG, and other common scanner output formats. There is no upload limit imposed by the tool because processing happens locally in your browser.
Upload additional pages
If your document spans multiple pages, upload all scanned images at once. The thumbnails appear in the queue in upload order. Drag them into the correct reading sequence: first page, second page, third, all the way to the last. You can also remove pages or insert new scans without restarting.
Convert to PDF
Click "Convert to PDF" and the browser assembles a single multi-page PDF with each scanned page embedded at its full original resolution. There is no recompression that would degrade text or signature detail. Conversion takes a couple of seconds even for thirty-page documents on a typical laptop.
Download and file
Download the finished PDF to your device. The scan is now in a properly structured document format ready for email attachment, cloud storage, secure file transfer portals, accountant review, court bundle inclusion, or any other downstream workflow that expects PDF input rather than loose image files.
Common situations where this approach makes a real difference:
Home user filing documents
A homeowner uses a Canon all-in-one printer to scan ten years of tax return documents stored in dog-eared paper files in the loft. They scan each page individually at 300 DPI, saving as JPG to keep file sizes manageable. After scanning 23 pages over a Saturday afternoon, they upload all 23 to FixTools, arrange them in chronological order by tax year, and convert to a single 35 MB PDF. The PDF is backed up to an external drive and Dropbox, finally letting them recycle the paper folders without losing the underlying records they may need for HMRC enquiries.
Small business owner
A sole trader scans five years of paper invoices and receipts for a VAT audit triggered by a routine HMRC review. Using an Epson flatbed at 300 DPI, they scan 120 receipts as individual JPGs over two evenings. They batch-upload in groups of 30 to FixTools, creating four neatly ordered multi-page PDFs by quarter, then merge all four into one master archive PDF using the FixTools PDF Merger. The accountant receives the 180-page PDF by email for review and acknowledges it the same day, well ahead of the HMRC deadline.
Legal assistant
A paralegal at a mid-sized firm scans a 15-page signed commercial contract using an HP scanner at 300 DPI, deliberately saving each page as PNG for lossless quality because the signature pages and corporate seals need to remain pixel-perfect for evidentiary purposes. Uploading all 15 pages to FixTools and converting to a single PDF produces a 45 MB archive document. After running through PDF Compressor with a quality-preserving preset, the file reaches 8 MB, comfortably within the firm's secure file transfer portal limit of 25 MB.
Student or researcher
A history doctoral researcher scans 30 handwritten archival letters from the 1940s using a museum's flatbed scanner at 600 DPI, saving as PNG to preserve every ink stroke, fold mark, watermark, and faint pencil annotation. Converting all 30 scans to a multi-page PDF via FixTools creates a 380 MB archival reference document. The uncompressed PDF lives on the university research server as the master; a compressed 40 MB version is used for conference presentations and emailed to thesis supervisors who do not need full-resolution access.
Get better results with these expert suggestions:
Scan at 300 DPI minimum for any document you may need to print later
Scanning at 150 DPI produces a JPG that looks fine on screen but prints visibly blurry at full A4 size, particularly on body text and any signature detail. 300 DPI gives 2480 x 3508 pixels for A4, which prints cleanly at full size on a domestic laser or inkjet printer. The file size difference between 150 and 300 DPI is typically a factor of three to five, a 300 KB page at 150 DPI becomes a 900 KB to 1.5 MB file at 300 DPI, still very manageable for any modern scanner and browser.
Name scanned files with a numeric prefix before uploading to control page order
Scanner software often names files with a timestamp or generic counter (Scan0001.jpg, Scan0002.jpg, IMG_20260528_143012.jpg), which makes alphabetical sort unreliable when the queue mixes timestamps and counters. If you rename files with a zero-padded numeric prefix (01-cover.jpg, 02-toc.jpg, 03-page-one.jpg) before uploading to FixTools, the thumbnails arrive in the correct order automatically. Renaming 25 files takes two minutes and eliminates the need to drag-reorder thumbnails manually inside the tool.
Use PNG for scans that will need close reading or zooming
JPG compression at typical scanner quality settings (80 to 90 percent) creates visible artefacts around handwritten letters, document stamps, and red ink that become obvious when zooming past 150 percent in a PDF viewer. For contracts, legal notices, certificates, or handwritten documents where a reader might zoom in to examine signatures, dates, stamps, or amendments, save the scan as PNG before converting to PDF. PNG preserves every ink detail exactly and the larger file size pays for itself in legibility.
Check every page in the assembled PDF before filing
After converting multi-page scans to PDF, open the finished PDF and scroll through every page before archiving or sending. Check that each page is right-way-up, in the correct reading order, and that no pages are missing or duplicated. Spotting an upside-down page seven or a swapped order between pages 12 and 13 before filing takes thirty seconds to fix by re-converting; discovering the same problem six months later when an auditor or counsel needs the document is a much bigger problem to unwind.
More use-case guides for the same tool:
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