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
- 1
Upload Your JPG or PNG
Drop any JPG or PNG into the tool. Nothing is uploaded — the file is read locally as bytes.
- 2
Pick a DPI Value
Click a preset (72, 96, 150, 200, 300, 600) or enter a custom DPI from 1 to 9999.
- 3
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.
More Image Tools
More free tools to edit, resize, and convert images in your browser.
Image Upscaler
Add real pixels with AI upscaling — up to 4× resolution.
Resize Image
Resize to exact pixel dimensions or print size.
Image Metadata Viewer
Inspect EXIF, DPI, and other metadata in any image.
Image Compressor
Reduce file size after editing without visible quality loss.
Check Image Dimensions
Check an image's DPI and the size it prints at in cm, mm or inches before you change it.
Change DPI — FAQ
Common questions about changing image DPI online