Change Image DPI Online — Free, Instant, Lossless
Set 72, 96, 150, 200, 300, or 600 DPI on any JPG or PNG. Metadata-only update — pixels untouched, zero quality loss.
When to Change Image DPI
Print Preparation
- Set 300 DPI for high-quality print output (magazines, brochures, posters)
- Set 600 DPI for fine-art prints, photo books, and gallery work
- Match printer specs that reject low-DPI images at submission
- Prepare scanned documents at the correct DPI for archival
Submission Requirements
- Meet stock photo site DPI minimums (often 300 DPI)
- Pass print-shop pre-flight checks that read DPI metadata
- Comply with academic / publication submission rules
- Fix images flagged as low-DPI by content management systems
Web & Display
- Set 72 DPI for legacy web workflows that strip print metadata
- Set 96 DPI to match modern Windows / macOS display defaults
- Normalize DPI across a batch of images from mixed sources
- Strip incorrect DPI tags written by phone cameras
How to Change Image DPI Online — 3 Steps
Upload Your JPG or PNG
Drop any JPG or PNG into the tool. Nothing is uploaded — the file is read locally as bytes.
Pick a DPI Value
Click a preset (72, 96, 150, 200, 300, 600) or enter a custom DPI from 1 to 9999.
Download the Updated Image
The DPI metadata is rewritten in place (JFIF for JPEG, pHYs for PNG). Pixels are unchanged. Click Download to save.
Free Online DPI Changer — JPG & PNG, Lossless, Browser-Based
DPI (dots per inch) is metadata that tells print software how large to render an image on paper. Changing DPI does NOT change the pixels — it only changes the declared print size. PicsSizer's DPI Changer rewrites the JFIF density tag (JPEG) or pHYs chunk (PNG) directly in the file bytes, in your browser, without re-encoding pixels. The output is bit-for-bit identical at the pixel level — only the metadata header changes.
What DPI Actually Does
A 3000×2000 pixel image is the same image whether tagged 72 DPI or 300 DPI. At 300 DPI it prints as 10 × 6.67 inches; at 72 DPI it prints as 41.67 × 27.78 inches. Web browsers ignore DPI entirely — they display pixel-for-pixel. So DPI matters only for print and submission systems that read the metadata. To increase real image detail, use the Image Upscaler instead — that adds pixels.
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Change DPI — FAQ
Common questions about changing image DPI online