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While unlikely, there may be an internal setting within your computer or network which is interfering with the upload process. Lastly, if you continue to have issues with your browsers or internet connection, if possible try uploading from a different computer at a different location (i.e. Please note, the larger your image the better it will display on IMDb, so only compress your image if necessary.
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If you have an unstable internet connection, a smaller image may help. If you are having trouble uploading very large files (18-20MB), please try compressing your image slightly. Actual sizes can vary slightly by fractions of an. Virtually all poster size designations throughout the site conform to a size standard. Most European movie poster sizes are based on the ISO 216 international paper size standard. IMDb recommends either Firefox or Chrome for image upload. For example, in the US, most movie posters sizes are based on the one sheet which is approximately 27x41 inches. If you continue to have issues, please try another browser. While image upload is supported on all newer browsers, please make sure your browser is completely up-to-date. All images intended for the web should be RGB, images intended for printing may be RGB or CMYK. Compare the most common poster sizes in pixels, millimeters and inches, and see how they compare to one another at a glance. Set the Preset to "Web" which will convert the image to the RGB color space. Learn how to scale your poster for peak impact and find the best poster size for your project. If you are unsure of the image file type, please open your image via an image editor (Photoshop, Illustrator, Corel Draw) and resave as a JPEG. Make sure your image is a JPEG, between 50 KB and 20 MB, and has an RGB color space.