What the PNG to PDF Converter does
The PNG to PDF Converter takes one or more PNG images and stitches them into a single multi-page PDF. Drop the files in, drag them into the page order you want, click convert, download the result. Each image becomes one page in the PDF, sized to that image's exact pixel dimensions. No cropping. No forced US Letter or A4 box. No watermark on the output.
The widget also accepts JPG and WebP if you have a mixed batch — the file picker doesn't gate on extension. We use "PNG to PDF" in the name because that's the search term most people type. If your batch is all photos, the JPG to PDF page has copy tuned to your case; if it's all WebP, use WebP to PDF instead.
What separates this tool from iLovePDF, SmallPDF, Sejda, PDF24, and the rest of the upload-first crowd is that nothing leaves your machine. The conversion runs in your browser using the pdf-lib JavaScript library. Open the network tab in DevTools, hit convert, and you'll see zero outbound requests during the operation. The page itself loaded from our CDN; everything after that is local to your laptop or phone.
When PNG to PDF is the right move
PNG is the format you reach for when an image has sharp edges and a limited palette. Screenshots from macOS, Windows, or a phone are PNG by default. Diagrams exported from Figma, Excalidraw, or Lucidchart are PNG. Anything from a design tool that has transparent backgrounds, hard lines, or text laid over flat color almost certainly came out as PNG. Those are the inputs this tool was built for.
Concrete cases where reaching for the PNG to PDF Converter is the right call:
- A bug report bundle. You captured 8 screenshots showing a UI regression. Email won't let you attach 8 separate PNGs, or the reviewer wants one file. One PDF, one attachment, ordered top-to-bottom the way you want them read.
- A diagram dossier. You exported 5 architecture diagrams from your whiteboard tool. The team wants them in one document for the design review. Combine them in the order they appear in the talk.
- Scanned receipts. Your scanner produces PNG by default for expense reports. Each month, you batch the receipts into one PDF for accounting. Same workflow every time.
- Print-ready proof sheets. A photographer's contact sheet, a set of mockups for client sign-off, a portfolio in PDF form. PNG preserves the colors and edges; PDF makes one file easy to email.
How to use the PNG to PDF Converter
The widget is a single screen with a drop zone at the top and a queue list underneath. Drag PNG files into the drop zone, or click it to open the file picker.
- Drop or pick the PNG images you want in the PDF. Up to 100 MB combined, 20 MB per image. JPG and WebP work in the same batch — no need to convert them first.
- Reorder the pages with the up and down arrow buttons next to each image. Page 1 of the PDF is the top of the list. Click the × to remove an image you added by mistake.
- Click "Convert to PDF." A small batch (5–10 images) finishes instantly. Fifty pages takes about 5 seconds, mostly spent decoding the PNG bytes.
- Click Download. The browser saves it as
converted.pdf. Rename it in the save dialog if you prefer something specific.
There's no Calculate button to press, no Convert After You Sign Up gate, no "Pro plan to unlock multi-page." If the file fits inside the limits, it converts. If you need to do this for a hundred PDFs a day, you can — there's no rate limit and no quota.
Tip: Renaming the PDF after the fact is a hassle if the browser save dialog defaults to the Downloads folder. Set Chrome / Firefox to "Ask where to save each file" once in settings, then every download gives you a name field. Saves a step every time you batch-convert.
How page sizing works (and why your pages might look mismatched)
Each page in the output PDF is sized to its source PNG's pixel dimensions, with the conversion 72 pixels per inch (72 points per inch is the PDF unit). A 1920×1080 PNG produces a 1920×1080 point page, which prints as roughly 26.67 × 15 inches if you sent it straight to a giant plotter. A 600×800 PNG produces a 600×800 point page — small. Mix them in one PDF and you get pages of wildly different sizes.
That's deliberate. The alternative would be scaling everything to a uniform letter or A4 page, which means either upscaling small images (blurry) or downscaling big ones (lossy). For most real use cases — screenshots, diagrams, receipts — you want the source dimensions preserved. Print software resizes on its own anyway.
Here's how common PNG sources translate:
| Source | Typical pixel size | PDF page size | Roughly equivalent paper size |
|---|---|---|---|
| macOS Retina screenshot, 13" MacBook | 2880 × 1800 | 2880 × 1800 pt | ~40 × 25 inches (huge) |
| Windows screenshot, 1080p monitor | 1920 × 1080 | 1920 × 1080 pt | ~26.7 × 15 inches |
| Phone screenshot, iPhone 15 | 1179 × 2556 | 1179 × 2556 pt | ~16 × 35 inches (tall) |
| Figma diagram export, 1x | 1200 × 800 | 1200 × 800 pt | ~16.7 × 11 inches |
| Receipt scan, 300 DPI | 2550 × 3300 | 2550 × 3300 pt | ~35 × 46 inches (huge) |
| Resized to US Letter at 72 DPI | 612 × 792 | 612 × 792 pt | 8.5 × 11 inches (Letter) |
If you want uniform 8.5 × 11 inch pages, resize the PNGs to 612 × 792 pixels first (using the Image Resizer), then convert. For A4 at 72 DPI, the target is 595 × 842. Resize first, convert second — that's the simplest path to a print-perfect PDF.
Worked example: a six-page screenshot report
Say you're filing a bug report. You captured six PNG screenshots on a 1080p Windows machine. Each is roughly 1920×1080 pixels, around 250 KB on disk. You want them in a single PDF, ordered to match the reproduction steps.
- You drop all six PNGs into the widget. The queue shows six entries. Total combined size: about 1.5 MB. Well under the 100 MB cap.
- The default order is the order the browser handed them over — usually alphabetical, which is rarely the order you want. You click the down arrow on screenshot #1 three times to move it to position 4 (where it actually fits in the repro steps). You delete screenshot #5 because it's a duplicate.
- Queue is now 5 items in the right order. Click Convert to PDF. About 1 second later, the download button activates.
- You download. The PDF is roughly 1.5 MB — about the sum of the source PNGs, with a tiny overhead for the PDF wrapper itself. Each page is 1920×1080 points. You attach it to the bug ticket.
The same operation on iLovePDF or SmallPDF involves uploading 1.5 MB to their server, queuing on their workers, downloading the result. If you're on a flaky cafe Wi-Fi or a phone tethered through 3G, that round trip is the slow part. With the PNG to PDF Converter the slow part is reading the bytes off disk, which is nearly free on any modern device.
PNG to PDF vs the alternatives
A frank comparison with the tools you've probably been using:
| Tool | Where conversion runs | File size limit | Watermark | Sign-up |
|---|---|---|---|---|
| Microapp PNG to PDF | Your browser | 100 MB combined | None | None |
| iLovePDF (free) | Their server | 10 MB / 25 file batch | No, but lower than paid | Optional, batch limits apply |
| SmallPDF (free) | Their server | 2 free tasks / hour | No | Email for >2 tasks |
| PDF24 (web) | Their server | Effectively unlimited | No | None, but uploads everything |
| Sejda (free) | Their server | 3 tasks / hour, 50 MB max | No | Sign-up to pass limits |
| Convertio / CloudConvert | Their server | Free tier caps | No | Account for batches |
The pattern is clear: every server-side tool eventually paywalls or rate-limits you, because their cost goes up with every conversion. Ours doesn't — your CPU does the work. That's the whole point of the architecture. It's the same reason a calculator on your phone doesn't have a "Pro plan to unlock division." Doing math on your own device shouldn't require a subscription. Doing image-to-PDF on your own device shouldn't either.
The Microapp pledge: 10% of our revenue goes to charity, off the top, audited quarterly. Same tool, same speed, same respect — for a bakery in São Paulo, a freelancer in Lagos, and a Fortune 500 designer who happens to need to bundle screenshots before a meeting.
When this isn't the right tool
A few cases where PNG to PDF isn't what you want:
- You need searchable text in the PDF. This tool embeds images, not text. If the PNG is a screenshot of a document and you need to extract the text later, you'd need OCR on the output. Microapp doesn't have an OCR tool yet (it's on the roadmap). Adobe Acrobat and macOS Preview can OCR a PDF after the fact.
- You're starting from photos, not screenshots. Photos are typically JPG out of the camera or phone. PNG to PDF works on JPG too, but the dedicated JPG to PDF page has copy tuned to photo workflows.
- You're starting from PDFs and you want PNGs out. That's the opposite direction — use PDF to PNG instead.
- You have a PDF and want to combine it with image pages. Convert your images here first, then use PDF Merger to combine with the existing PDF.
- You want a uniform page size end-to-end. Resize the PNGs to your target dimensions (612 × 792 for US Letter, 595 × 842 for A4) using the Image Resizer before converting. The PNG to PDF Converter doesn't reflow content to a target page on its own.
- The PDF needs to be small enough to email. The PNG to PDF Converter doesn't recompress images — it embeds them at original size. Use the PDF Compressor on the output if size matters.
Related tools
If you're working with images and PDFs regularly, you'll probably reach for these alongside the PNG to PDF Converter:
- PDF Merger — Combines existing PDFs (or PDFs plus the output of this tool) into one document. Useful when you already have a PDF and want to append a few image pages.
- JPG to PDF — Same architecture, copy tuned to photo workflows. Use this if your batch is mostly photographs.
- PDF to PNG — The reverse direction. Extract each PDF page as a PNG.
- Image Resizer — Resize PNGs to a target dimension before converting, so all pages match.
- PDF Compressor — Shrinks the output PDF if it's too big to email. Runs in-browser, same architecture.
- Rotate PDF — Rotate a sideways-scanned page to upright. Useful when one of your PNGs came in at the wrong orientation.
Frequently asked questions
Are my images really not uploaded?
Correct. The conversion runs in your browser via the pdf-lib JavaScript library. Your image bytes go from your file system to the browser's memory to the output PDF blob, never to a server. You can verify this in your browser's network tab — there are zero outbound requests during the convert step. The Microapp page itself loaded from our CDN; everything after that is local.
Can I do JPG to PDF here too?
Yes. The widget accepts JPG, JPEG, PNG, and WebP. We use the PNG name because that's the dominant search term, but the code path handles all three formats. For a JPG-specific variant with copy tuned to photo workflows, the JPG to PDF page is the better entry point.
What's the maximum file size?
20 MB per image, 100 MB combined. Most phone photos are 2–5 MB; you can fit 20–50 images well within the combined cap. For larger jobs (a 200-page scanned book), either batch the conversion into chunks or compress the source images first with the Image Compressor.
What page size does the PDF use?
Each PDF page is sized to its source image's exact pixel dimensions in points (72 points per inch). A 1920 × 1080 image becomes a 1920 × 1080 point page. This preserves aspect ratio with no cropping. If you need uniform page sizes (US Letter, A4, etc.), pre-resize the PNGs in the Image Resizer first.
Why is my PDF so big?
Because each image is stored at its original resolution. A phone photo at 4032 × 3024 is around 3 MB; 10 of them produces a roughly 30 MB PDF. To shrink: resize the source images to ~1500 × 1000 (still print quality) before converting, or run the output through a PDF compressor. PDF does no recompression on its own — it embeds the images as-is.
Is the output PDF searchable?
Not by default — the PDF contains images, not text. To make it searchable, run it through OCR. Most modern PDF readers (Adobe Acrobat, macOS Preview) can OCR a PDF after the fact. Microapp doesn't have an OCR tool yet, but it's on the roadmap.
What's the difference between PNG and JPG inside a PDF?
PNG preserves transparency and uses lossless compression — best for screenshots, diagrams, line art, anything with sharp edges and limited colors. JPG uses lossy compression — smaller files for photographs but visible artifacts on text and edges. PDF supports both natively. PNG inputs make larger PDFs than JPG inputs for the same content. Use the format that matches your source; don't convert PNG to JPG just to shrink the PDF (you'll lose quality and probably won't save much).
Can I reorder pages after I download the PDF?
Not in the PDF itself directly with this tool, but the Reorder PDF Pages tool handles that. Easier to get the order right in the queue before clicking Convert.