Browse exact tasks, licensed drawings and font families by category.
Creator Utilities - names starting with: any letter. All names in this category. All categories.
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.
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.
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.
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.
See exactly how much of your frame disappears when it is cropped to a different aspect ratio, and what the resulting crop box is.
Convert across the bit/byte boundary that causes most media-maths mistakes: connection speeds are quoted in bits, file sizes in bytes.
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.
Work backwards from a file size limit to the bitrate you need to encode at, with the audio track budgeted separately.
Estimate the size of an exported video from its total bitrate and duration, including the audio track, before you spend time encoding it.
Free video, audio and image format converters. Everything runs in your browser - no upload, no login, no watermark.
Every audio format conversion, running free in your browser. No upload, no login.
Convert a AAC file to FLAC entirely in your browser. Free, no login, no upload - the file never leaves your device.
Convert a AAC file to M4A entirely in your browser. Free, no login, no upload - the file never leaves your device.
Convert a AAC file to MP3 entirely in your browser. Free, no login, no upload - the file never leaves your device.
Next 48 resources