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Turn your own ideas and recordings into short videos and carousels. Your voice. Your style. Ready to share.
Existing Koldflux Free creator tools resource.
Current Koldflux service signals and their limits.
Free, no-upload tools for TikTok, Reels, Shorts and every short-form platform: converters, croppers, compressors, image sizes, safe zones, caption limits and text utilities. No login, no watermark, no daily limit.
Why Koldflux tools process files in your browser, how platform references are reviewed, and what we do and do not collect.
Crop video or images to 9:16, 16:9, 1:1, 4:5, 4:3 or 21:9 in your browser. Free, no upload, no watermark.
Crop any image to a 1:1 aspect ratio (1080×1080) in your browser. Free, no login, nothing uploaded.
Crop any image to a 16:9 aspect ratio (1920×1080) in your browser. Free, no login, nothing uploaded.
Crop any image to a 21:9 aspect ratio (2560×1080) in your browser. Free, no login, nothing uploaded.
Crop any image to a 4:3 aspect ratio (1440×1080) in your browser. Free, no login, nothing uploaded.
Crop any image to a 4:5 aspect ratio (1080×1350) in your browser. Free, no login, nothing uploaded.
Crop any image to a 9:16 aspect ratio (1080×1920) in your browser. Free, no login, nothing uploaded.
Crop any video to a 1:1 aspect ratio (1080×1080) in your browser. Free, no login, nothing uploaded.
Crop any video to a 16:9 aspect ratio (1920×1080) in your browser. Free, no login, nothing uploaded.
Crop any video to a 21:9 aspect ratio (2560×1080) in your browser. Free, no login, nothing uploaded.
Crop any video to a 4:3 aspect ratio (1440×1080) in your browser. Free, no login, nothing uploaded.
Crop any video to a 4:5 aspect ratio (1080×1350) in your browser. Free, no login, nothing uploaded.
Crop any video to a 9:16 aspect ratio (1080×1920) in your browser. Free, no login, nothing uploaded.
Check your Twitch profile banner image locally, compare measured fields with the dated source, then crop or pad to the recommended canvas and recheck the output.
Check your YouTube video thumbnail image locally, compare measured fields with the dated source, then crop or pad to the recommended canvas and recheck the output.
Even out an audio file to a consistent, platform-safe loudness level entirely in your browser. Free, no login, no upload.
Trim leading and trailing silence from an audio file entirely in your browser. Free, no login, no upload.
Cut an audio file down to a set number of seconds from the start, entirely in your browser. Free, no login, no upload.
Read the RGBA and hex value of an exact pixel in your PNG or JPEG, with coordinates and alpha shown separately. The image stays on your device.
Free browser calculators for the arithmetic that comes up before an export: file size from bitrate, bitrate for a target size, aspect ratios, crop loss, frame counts, upload time and storage.
Calculate gross commission on eligible sales using the rate you supply. This is a scenario, not verified revenue or an earnings prediction.
Reduce any width × height to its simplest ratio, and solve for the missing side when you know the ratio and one dimension.
Estimate how much space an audio track takes at a given bitrate, and what that costs inside a video file.
Compare the original and compressed sizes to see the real saving, the ratio, and how much quality budget each remaining megabyte represents.
Spend is the numerator. Delivered impressions, including repeat exposures under your reporting definition, are the denominator.
See exactly how much of your frame disappears when it is cropped to a different aspect ratio, and what the resulting crop box is.
Recorded clicks are the numerator. Delivered impressions from the same reporting period and attribution scope are the denominator. Repeat clicks can make a non-unique rate exceed 100%.
Convert across the bit/byte boundary that causes most media-maths mistakes: connection speeds are quoted in bits, file sizes in bytes.
Convert one image dimension from pixels to physical inches at your chosen print density. Repeat for the other dimension; file DPI metadata does not create pixels.
The inverse of cropping: instead of cutting the frame down, fit all of it inside a target shape and add bars. Shows the exact bar thickness and the scaled content size.
Find the duration a clip becomes after a speed change, and the speed factor needed to hit a target duration.
Convert between a duration, a frame rate and a total frame count - useful when an editor reports frames and an upload limit is in seconds.
Convert width × height into total pixels and megapixels, with the aspect ratio alongside.
Scale a resolution by a percentage or to a target width, keeping the aspect ratio and rounding to encoder-safe even dimensions.
Turn safe-zone percentages into exact pixel margins for your frame, so you can place guides in your editor.
Estimate how long a script will take to say out loud, and work backwards from a platform duration limit to the word count that fits.
Work out how many minutes of footage fit on a card or drive at a given bitrate.
Convert HH:MM:SS:FF timecode to seconds and back at any frame rate. Frames are not decimals, which is why timecode arithmetic done by hand usually goes wrong.
Work out the size of uncompressed PCM audio from its sample rate, bit depth and channel count - the reason a WAV dwarfs the MP3 of the same recording.
Estimate transfer time from a file size and a connection speed, with the megabit/megabyte confusion handled for you.
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