Tools
Free utilities for broadcast & post.
Quick, accurate tools for the everyday maths of delivery: timecode, file size, safe areas, loudness, audio layouts, reading speed. They run entirely in your browser — no sign-up, no upload, nothing stored.
Timecode calculator
Add, subtract and convert SMPTE timecode across frames and real time: 23.976 to 60 fps, drop-frame and non-drop.
Open →Video file size calculator
Estimate master/mezzanine size from duration, codec, resolution and frame rate: ProRes, DNxHD, AVC-Intra, XDCAM, uncompressed.
Open →Safe areas & aspect ratio
EBU R95 action/graphics safe and DPP/BBC caption cages at any resolution. Downloadable transparent PNG overlay, plus letterbox/pillarbox maths.
Open →Audio track layouts
EBU R123 / R48 track allocations as visual channel maps, the 5.1 broadcast-vs-film order trap, Dolby E placement, and broadcaster examples.
Open →Loudness targets & gain
EBU R128, ATSC A/85 and real broadcaster deliveries (target, tolerance and true-peak ceiling in one table), plus a gain-to-target calculator.
Open →Frame rate & runtime
Runtime conversion between rates: PAL speed-up (exactly 25/24), 2:3 pulldown frame counts, and which conversions change runtime and pitch.
Open →Subtitle reading speed
Characters-per-second and WPM against Netflix / EBU limits (one cue or a whole SRT, WebVTT, TTML, EBU-STL or SCC file), counted exactly as a QC engine does.
Open →Leader & clock builder
Build a start-of-programme leader — bars & 1 kHz tone, countdown clock, editable slate, black to programme start — as a timing sheet, a live clock, or a downloadable MP4.
Open →In-browser pre-flight
Drop a MOV/MP4/MXF and check its header (container, resolution, rate, scan, bit depth, audio layout) against a real broadcaster spec. Nothing uploaded.
Open →Values are drawn from the published standards and broadcaster delivery specs each tool names (EBU R 128, R 95, R 123, ITU-R BS.1770, ATSC A/85, DPP/AS-11 and the UMDP profiles). Always defer to the spec you were commissioned against.