Who Benefits From Custom PRD build Pie and Donut Charts
Reviewed by the OnlineFree.app team · Updated
Key points
- Custom PRD build turns pasted labels and values into a titled pie or donut chart and downloads it as SVG or PNG.
- Everything runs in the browser — no signup, no upload, and no server round-trip.
- The tool accepts up to 40 slices, but pies stay readable at roughly five to seven.
- SVG is the better export for print and editing; PNG is the faster drop-in for slides.
- Check pasted values against your source spreadsheet before sending the chart out.
Who gets the most from Custom PRD build
Custom PRD build turns a pasted list of labels and values into a clean, titled pie or donut chart and lets you download it as SVG or PNG, entirely in the browser. There is no account, no install, and no upload — you paste, glance at the preview, and download.
The people who benefit most are holding a handful of numbers they already understand: an analyst with a column of counts copied out of a spreadsheet, a student summarising survey responses, a marketer who needs one chart for a slide or a social post. In each case the dataset is small, the deadline is short, and opening Excel or learning a charting library costs more than the chart is worth.
It is a deliberately narrow tool. If you need twelve categories, a time series, or a chart that updates when the sheet changes, this is not the right instrument — the readability notes below explain where it stops being useful. For a one-off snapshot, the Custom PRD build page finishes the job in about the time it takes to describe it.
The one-minute paste-and-download workflow
The interface is a split screen: controls on the left, a sticky live preview on the right with the download buttons directly beneath it. The chart re-renders on every keystroke, so there is no generate button and no guessing whether an edit landed.
In order: paste labels into the first box, one per line or comma-separated; paste the matching numeric values into the second; type a title of up to 80 characters if you want one; choose pie or donut; decide whether slices show percentages. Then hit Download SVG or Download PNG. That is four inputs and one click, which is why the loop survives a rushed deadline.
On a phone the two columns stack — inputs first, chart below — with no horizontal scrolling. The prefilled sample (Chrome, Safari, Edge, Firefox with 65, 18, 10, 7) is there to be overwritten rather than deleted; replacing text is faster and less error-prone than typing into empty boxes.
How do you format labels and values correctly?
Two boxes, two different rules. Labels are free text, trimmed of blank lines, and can be written one per line or separated by commas. Values must be numbers only: zero is allowed, while negatives and anything non-numeric are rejected rather than silently discarded.
The most common failure is a count mismatch. Five labels with four values produces a warning instead of a silent one-to-one pairing, and you should take it seriously — a dropped category is easy to miss once the wedges are coloured. The second most common failure is spreadsheet formatting: a value of 1,234 contains a comma, and the field treats commas as separators, so strip thousands separators before pasting and confirm the preview matches your source.
One edge case is worth knowing in advance. If every value is zero, the percentages would be a division by zero, so the preview shows an empty state instead of broken angles. That is a signal that the paste did not take, not a bug in the renderer.
Why the SVG export matters
There are two download buttons because they do different jobs. The SVG is a serialized standalone file — a vector chart that stays sharp at any zoom and reopens in Illustrator, Figma, or Inkscape for restyling. It is a plain standard document, the same format described in the W3C's SVG 2 specification.
The PNG is a canvas raster rendered at twice the preview's pixel size. That detail matters: the dimensions of your preview area decide the pixel dimensions of the file, so a wider browser window yields a larger PNG. For a slide, a document, or a chat message that is usually plenty; for print, take the SVG.
A third button copies the SVG code to the clipboard for pasting into a document or a codebase. Two honest caveats: text inside an SVG is drawn with whatever fonts the viewer has, so a distinctive typeface can shift on another machine, and the exported file carries your label text — if the numbers are confidential, the file is the thing to protect.
When is a pie chart the wrong choice?
A pie or donut encodes parts of a whole, and it only works when the parts genuinely add up to one thing. Rates, averages, and overlapping counts belong in a bar chart. The UK Government Analysis Function's data visualisation guidance makes the same argument: keep the number of categories low and pick the chart type to fit the comparison, not the other way round.
Readability, not capacity, is the real ceiling. Custom PRD build will accept up to 40 slices, but a 40-slice pie is a colour wheel — the small wedges stop being comparable and the legend becomes a list. Five to seven categories is roughly where a pie still communicates; beyond that, group the tail into an "Other" slice.
A final check before publishing: the chart reflects the numbers you typed, not the numbers you meant. Sort the values first if ordering matters, and compare the percentages in the legend against any figures quoted elsewhere in the report, since the tool computes its own shares from the pasted values. If you need a quick cross-check on other figures, the wider OnlineFree.app index has small utilities for that.
Small choices that make the chart usable
The title field takes up to 80 characters and is optional, but an untitled chart is a puzzle. "Browser Share" beats "Chart 1". Use the space to say what the data is and, if it helps, over what period.
The percentage toggle changes what appears on the wedges, while the legend always shows the raw value. Leave percentages on when the question is share of a whole; turn them off when your audience needs exact counts and the labels already carry them. A donut's 55% inner radius leaves a hole you could put a headline number in, but the tool does not add one for you.
Colours come from a fixed slate-indigo palette rather than a picker, which keeps a series of charts looking like a set — and means you cannot tune contrast per audience. If the chart is going on a public page or into a printed report, check the palette against the contrast requirements your organisation uses before you publish. For a matching view of the same data, the Custom PRD build companion page follows the same no-signup pattern.
Frequently asked questions
Is Custom PRD build free, and do I need an account?
No account is needed. Custom PRD build is free to use, with no signup, email, install, or watermark, and no daily download counter. You open the page, paste your labels and values, then download the SVG or PNG. It sits alongside the other utilities on OnlineFree.app, so there is nothing to trial or upgrade mid-deadline.
Do my numbers get uploaded when I use Custom PRD build?
No. Custom PRD build renders the chart as inline SVG in your browser and rasterizes the PNG locally on a canvas, so the values never leave your device. The one thing to remember is that the downloaded SVG file itself contains your labels and numbers — treat the file, not the tool, as the place where the data lives.
How many slices can Custom PRD build handle?
Custom PRD build accepts up to 40 labels, but that is a technical cap rather than a readability target. Pies and donuts stay legible at roughly five to seven slices; beyond that the small wedges shrink and the legend does the work. Negative values are rejected, and an all-zero list shows an empty state instead of a broken chart.
What is the difference between the SVG and PNG downloads?
The SVG download is a standalone vector file that stays sharp at any size and can be reopened in Illustrator, Figma, or Inkscape. The PNG is a raster image at twice the preview's pixel size, which is fine for slides, documents, and chat. Use SVG for print and further editing, PNG when the destination just needs a picture.
Can I edit the chart after downloading it from Custom PRD build?
Yes — the SVG is a normal vector file, so you can recolor wedges, move the legend, or restyle text in any vector editor, or paste the copied SVG code straight into HTML. What you cannot do is return to the tool and recover a chart you did not save; nothing is stored, so keep the downloaded file.