To make video captions easier to read: use accurate text, divide speech into meaningful phrases, give each caption enough time on screen, choose clear typography, maintain contrast, and position the text away from important visual information.
The insight that reorganises the whole subject: readability is a system, not a font setting. A caption can be perfectly spelled and still be difficult to read, and increasing the font size will not fix poor grouping, rushed timing or an overloaded frame.
The words and the groups
Accuracy comes before readability styling, because the fastest-reading wrong sentence is still wrong: "This does not replace final approval" without the not is the classic. Then group by meaning. The word not belongs with the statement it changes; a break after it briefly claims the opposite. Never separate an article from its noun, a number from its unit, a negation from its claim, or the halves of a product name.
Time and sync
The viewer performs four steps per caption: notice it, read it, connect it to the speech, get ready for the next one. Cutting pauses out of the audio quietly steals the time those steps need. Signals you are too fast: captions wipe before completion, viewers pause to read, the last word never lands. Avoid fixed duration rules; the content sets the clock. And sync to the phrase: a caption that arrives well before or after its sentence reads as noise even when the text is perfect.
Type, case and contrast
Typography earns its keep in the ugly cases: does the font keep I, l and 1 apart, O and 0 distinguishable? Too thin disappears into footage; too heavy turns the block solid. Sentence case preserves word shapes and reads fastest; uppercase is an accent, not a default; consistency beats switching. Then test contrast where it actually breaks: the lightest scene, the darkest scene, the busiest B-roll, skin tones, screen recordings. And do not over-armour: box plus outline plus heavy shadow means the base choice failed. Choose the simplest treatment that survives the hardest scene.
Position and hierarchy
Position predictably, and per scene: low for a talking head, in a dedicated top or side zone over screen recordings, away from the demonstrated detail in product close-ups. When several text layers share the frame (headline, captions, label, CTA), give them explicit hierarchy; when everything demands attention, nothing gets priority. Limit highlighting the same way: the isolated-word test asks whether a viewer who notices only the highlighted words still gets an accurate message.
Two collision rules cover most incidents: never two dense reading tasks at once (captions over text-heavy recordings), and never solve a collision by shrinking the captions to illegibility.
Review like a viewer
Five passes, in order: text, grouping, timing, design, complete composition. Do them at realistic size, on a phone, not an enlarged caption preview. Add a sound-off pass (it exposes what your ears were fixing) but never let it replace comparison with the audio. And judge the exported file, because rendering changes typography, breaks and position; approval applies to the rendered output, not the editor preview.
For translated subtitles, one extra honesty: a correct translation forced into the source language's timing and breaks can still be unreadable. Regroup and retime for the target language.
Where ReadyForm fits
The readability levers above are exactly the controls ReadyForm exposes: words per caption, text size, weight, case, line height, letter spacing, position, highlight background and contrast effects, with brand colours applied live and the whole thing previewed on your actual footage. The system defaults are designed; the judgement at phone size stays yours. See the captions feature.