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Every tool below exists because someone hit a real wall — a video Discord refuses, a passport photo the wrong size, a photo leaking your home location. Pick the problem, get the fix. Nothing is uploaded, nothing needs an account.
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Upload your JPG to convert image to 300 dpi, check the target is set to 300 — the print standard — and download the same image with the new DPI written into its metadata. Hand that file to the print shop and it will pass their check without the pixels changing. It is free, no signup needed, and everything runs in your browser.
DPI metadata alone does not add pixels — it tells the printer how large to print them. For a truly sharper print you also need enough pixels: at 300 DPI, a 10×15 cm print needs about 1181×1772 px.
300 DPI is the standard for photos and documents. Large posters viewed from far away can use 150 DPI.
Screens ignore DPI entirely and just show pixels. The number only matters for print size.
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