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JPG → PDF
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Fast, secure JPG to PDF conversion. No registration required.
Converting JPG to PDF is the standard way to send photos as a single document — scans of an ID, receipts for an expense report, a stack of homework pages, or a portfolio to a recruiter. PDF lets you stitch multiple JPGs into one paginated file that opens identically on every device, supports digital signatures, and is easy to password-protect. KaijuConverter wraps each JPG onto an A4 or Letter page (configurable), preserves the original resolution so nothing looks soft when printed, and embeds image metadata as proper PDF annotations. Combine up to fifty images into a single PDF on the free tier.
JPEG Image
Source formatJPEG is the most widely used lossy image format on the web. It achieves small file sizes through adjustable compression, making it ideal for photographs and complex images where some quality loss is acceptable.
PDF Document
Target formatPDF is the universal standard for sharing documents with consistent formatting across all devices and operating systems. It preserves fonts, images, and layout exactly as intended by the author.
Why convert JPG to PDF
Sending five JPGs as five attachments is clumsy; sending one PDF is professional. PDF is also the right archival format — it is paginated, printable at a predictable size, and universally readable without any image viewer. For ID scans, receipts and homework submissions, PDF is the format institutions actually ask for, and it is much harder to accidentally edit than a raw image.
HOW TO CONVERT
JPG → PDF
Upload one or many JPGs
Drag up to 50 images per job on the free tier. Reorder them by dragging the thumbnails before converting.
Choose page size
A4 by default. US Letter, Legal or "fit to image" are available for custom sizes.
Download the PDF
One PDF containing every image at full resolution, ready to email or sign.
Common Use Cases
ID and passport scans
Most government and banking forms want a single PDF of both sides of an ID, not two separate JPGs.
Expense reports
Combine all your receipt photos into one PDF per trip for finance teams and HMRC-style submissions.
Homework and assignments
Photos of handwritten pages bundled into one PDF is the standard submission format for most LMS platforms.
Portfolios and lookbooks
Share a portfolio as a single downloadable PDF instead of forcing the recruiter to open fifteen images.
JPG vs PDF — Strengths and limitations
What each format does best, and where it falls short.
JPG Strengths
- Excellent compression ratio for photographs (10:1 or better without visible quality loss).
- Universal support — every camera, phone, OS, and browser reads JPEG natively.
- Adjustable quality setting balances file size against visual fidelity.
- Embeds EXIF metadata (camera model, GPS, exposure) automatically.
- Progressive rendering for graceful loading over slow networks.
Limitations
- Lossy — every save degrades the image further (generation loss).
- No transparency channel (use PNG or WebP for that).
- Visible compression artifacts on text, sharp edges, and flat colors.
PDF Strengths
- Pixel-perfect fidelity across operating systems, browsers, and printers.
- Embeds fonts, so documents render identically without the reader having them installed.
- Supports digital signatures, encryption, and redaction for legal workflows.
- ISO-standardized (ISO 32000) with multiple validated subsets (PDF/A, PDF/X, PDF/UA).
- Supports both vector and raster content, keeping line art crisp at any zoom level.
Limitations
- Editing is difficult — the format is optimized for display, not mutation.
- Text extraction can scramble reading order in multi-column layouts.
- File sizes balloon quickly when embedding high-resolution images or fonts.
JPG vs PDF — Technical specifications
Side-by-side comparison of the technical details.
JPG
- MIME type
- image/jpeg
- Compression
- Lossy — Discrete Cosine Transform + quantization + Huffman coding
- Color depth
- 8 bits per channel (24-bit RGB or 8-bit grayscale)
- Max dimensions
- 65,535 × 65,535 pixels (baseline)
- Transparency
- Not supported
- Typical quality
- 75–90 for web, 95+ for print
- MIME type
- application/pdf
- Compression
- Flate, LZW, JBIG2, JPEG, JPEG 2000
- Current version
- PDF 2.0 (ISO 32000-2:2020)
- Max file size
- ~10 GB (practical); 2^31 bytes (theoretical per object)
- Color models
- RGB, CMYK, Grayscale, Lab, DeviceN, ICC-based
- Standard subsets
- PDF/A, PDF/X, PDF/UA, PDF/E, PDF/VT
| Specification | JPG | |
|---|---|---|
| MIME type | image/jpeg | application/pdf |
| Compression | Lossy — Discrete Cosine Transform + quantization + Huffman coding | Flate, LZW, JBIG2, JPEG, JPEG 2000 |
| Color depth | 8 bits per channel (24-bit RGB or 8-bit grayscale) | — |
| Max dimensions | 65,535 × 65,535 pixels (baseline) | — |
| Transparency | Not supported | — |
| Typical quality | 75–90 for web, 95+ for print | — |
| Current version | — | PDF 2.0 (ISO 32000-2:2020) |
| Max file size | — | ~10 GB (practical); 2^31 bytes (theoretical per object) |
| Color models | — | RGB, CMYK, Grayscale, Lab, DeviceN, ICC-based |
| Standard subsets | — | PDF/A, PDF/X, PDF/UA, PDF/E, PDF/VT |
JPG vs PDF — Typical file sizes
Approximate file sizes for common scenarios.
JPG
- Phone photo (12 MP, quality 85) 2–5 MB
- Web thumbnail (400px) 20–60 KB
- Full-page magazine photo 500 KB – 2 MB
- Social-media square (1080×1080) 100–400 KB
- 1-page text-only memo 50–150 KB
- 10-page report with images 500 KB – 2 MB
- Scanned document (per page) 100 KB – 1 MB
- Full-color magazine (48 pages) 10–40 MB
Quality & Compatibility
Image quality inside the PDF is identical to the source JPGs — they are embedded, not re-encoded. File size roughly equals the sum of the JPGs plus a few kilobytes per page of PDF overhead. Page orientation is detected automatically from image dimensions; portrait JPGs get portrait pages. For scans that matter (contracts, IDs) keep the JPG at 300 DPI or higher before converting so the PDF prints at letter size without pixelation.
Tips for Best Results
- Order JPGs by filename before uploading — the PDF preserves that order. Rename scanner outputs 01-front.jpg, 02-back.jpg etc. for predictable results.
- For scans that need OCR (searchable PDFs), pick "Add OCR text layer" in Advanced. This makes the text inside the images searchable in Acrobat and Preview.
- Photos of documents should be captured in good light and cropped tightly before conversion — the PDF embeds the JPG as-is and will not clean up bad lighting.
Frequently Asked Questions
Yes. Upload up to 50 JPGs and they become a single multi-page PDF in the order shown in the thumbnail strip. Drag thumbnails to reorder before clicking Convert. Paid plans raise the per-job cap to 500 images for bulk archival work.
A4 (210×297 mm) by default, which matches most of the world. US Letter, Legal and "Fit to image" are available in Advanced. "Fit to image" sizes each page to the image's actual dimensions, useful for non-standard receipts or panoramic photos.
No. We embed the original JPG bytes as-is, so image quality inside the PDF is identical to the source file. The PDF is simply a paginated wrapper around your JPGs — nothing is re-encoded.
Yes. Tick "Add OCR text layer" in Advanced and the PDF will include invisible text behind each image so Ctrl-F works in any PDF reader. English, Spanish, French and German are supported. OCR accuracy depends on photo clarity — glare and skew reduce quality.
Yes. Toggle "Encrypt PDF" in Advanced. Set a user password (required to open the file) and optionally an owner password that limits printing or copying. Passwords are applied on the server and never stored after the conversion finishes.
Yes. The free tier handles up to 50 images per job at up to 100 MB total, with no watermarks, no registration and no email capture. Paid plans raise caps and unlock batch processing, priority queueing and an API key for unattended workflows.
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Read guideSecure & Private Conversion
Your files are encrypted during transfer, processed in isolated containers, and automatically deleted within 60 minutes. We never read, share, or store your data.