gpdf Blog Release notes, renderer deep dives, and community stories from the gpdf project. https://gpdf.dev/rss.xml 2026-09-02T00:00:00.000Z gpdf-cloud How do I align a gpdf column to the right edge of a row? https://gpdf.dev/blog/align-column-right-edge 2026-09-02T00:00:00.000Z 2026-09-02T00:00:00.000Z Two things need to happen: a filler Col to push the column to the right edge, and template.AlignRight() on the text inside it. Here's the gpdf code. Taiki Noda https://nadai.dev/en/about Page numbers, headers, and footers that just work in Go PDFs https://gpdf.dev/blog/page-numbers-headers-footers 2026-05-19T00:00:00.000Z 2026-05-19T00:00:00.000Z Add headers, footers, and 'Page X of Y' in Go PDFs with gpdf: two builder methods, a two-pass paginator that fills in the totals, no shims required. gpdf team https://gpdf.dev gpdf vs wkhtmltopdf vs Chromium-based PDF generation https://gpdf.dev/blog/gpdf-vs-wkhtmltopdf-vs-chromium 2026-05-18T00:00:00.000Z 2026-05-18T00:00:00.000Z wkhtmltopdf is archived. Chromium ships a 170 MB browser per request. gpdf renders a page in 13 µs with no browser. Here's the honest 2026 comparison. Taiki Noda https://nadai.dev/en/about How do I nest a Row inside a Col in gpdf? https://gpdf.dev/blog/nest-row-in-col 2026-05-16T00:00:00.000Z 2026-05-16T00:00:00.000Z You can't — ColBuilder has no Row method in gpdf. The 12-column grid is flat by design. Here are the three idioms that replace nested rows. Taiki Noda https://nadai.dev/en/about How do I make a table span multiple pages? https://gpdf.dev/blog/multi-page-table 2026-05-12T00:00:00.000Z 2026-05-12T00:00:00.000Z You don't do anything. Feed gpdf a table with more rows than fit, and it paginates the body and repeats the header on every page automatically. Taiki Noda https://nadai.dev/en/about How do I mix two fonts in the same paragraph in gpdf? https://gpdf.dev/blog/mix-two-fonts-in-paragraph 2026-05-11T00:00:00.000Z 2026-05-11T00:00:00.000Z To mix fonts in one paragraph in gpdf, call c.RichText and set template.FontFamily on each span — c.Text only styles the whole string at once. Taiki Noda https://nadai.dev/en/about Tables in Go PDFs: column widths, striped rows, page breaks https://gpdf.dev/blog/tables-in-go-pdfs 2026-05-07T00:00:00.000Z 2026-05-07T00:00:00.000Z Tables are the hardest part of a Go PDF. gpdf collapses widths, stripes, and multi-page header repeat into one Table call — here is the whole API and what it costs. Taiki Noda https://nadai.dev/en/about From signintech/gopdf to gpdf: less coordinate math https://gpdf.dev/blog/signintech-gopdf-migration 2026-05-06T00:00:00.000Z 2026-05-06T00:00:00.000Z signintech/gopdf works, but every cell, line, and header is an (x, y) calculation. This guide maps the gopdf API to gpdf — same Go, no coordinate math. Taiki Noda https://nadai.dev/en/about How do I scale an image proportionally to fit a column? https://gpdf.dev/blog/scale-image-fit-column 2026-05-05T00:00:00.000Z 2026-05-05T00:00:00.000Z gpdf already does it. c.Image(bytes) fills the column width and preserves aspect ratio. Use FitWidth or FitHeight for explicit bounds, WithFitMode for the non-default behaviors. Taiki Noda https://nadai.dev/en/about How do I create striped (zebra) table rows? https://gpdf.dev/blog/zebra-striped-table-rows 2026-05-04T00:00:00.000Z 2026-05-04T00:00:00.000Z Pass template.TableStripe to a table call. gpdf paints the alternate body rows with the color you give it. No row-loop, no manual cell styling. Taiki Noda https://nadai.dev/en/about How do I add a custom TrueType font to gpdf? https://gpdf.dev/blog/add-custom-truetype-font 2026-04-30T00:00:00.000Z 2026-04-30T00:00:00.000Z Load TTF bytes, register with gpdf.WithFont, then reference the family name. Works for any TrueType — Inter, Roboto, icon fonts, brand fonts. Taiki Noda https://nadai.dev/en/about unipdf is AGPL or paid. Here's how to migrate to gpdf. https://gpdf.dev/blog/unidoc-migration 2026-04-29T00:00:00.000Z 2026-04-29T00:00:00.000Z UniDoc's unipdf forces AGPL v3 or a per-developer commercial license. This guide maps the unipdf creator API to gpdf — MIT, zero deps, no license key. Taiki Noda https://nadai.dev/en/about Bootstrap thinking for PDF: gpdf's 12-column grid https://gpdf.dev/blog/bootstrap-grid-thinking-for-pdf 2026-04-29T00:00:00.000Z 2026-04-29T00:00:00.000Z gpdf borrows the 12-column grid from Bootstrap, but PDFs aren't web pages. Here's why 12 still works, and what we threw out: breakpoints, gutters, order. Taiki Noda https://nadai.dev/en/about How do I set column widths in a gpdf table? https://gpdf.dev/blog/table-column-widths 2026-04-28T00:00:00.000Z 2026-04-28T00:00:00.000Z Pass template.ColumnWidths(...) to c.Table. Values are percentages of the parent column's width. Sum to 100; trailing missing values auto-distribute. Taiki Noda https://nadai.dev/en/about How do I embed a PNG with transparency in gpdf? https://gpdf.dev/blog/embed-png-transparency 2026-04-28T00:00:00.000Z 2026-04-28T00:00:00.000Z Pass the PNG bytes directly to c.Image. gpdf decodes the alpha channel into a PDF SMask so transparent backgrounds render correctly. Taiki Noda https://nadai.dev/en/about How do I use bold and italic together in gpdf? https://gpdf.dev/blog/bold-italic-together 2026-04-23T00:00:00.000Z 2026-04-23T00:00:00.000Z Bold and italic on the same span work via template.Bold() and template.Italic(). For TrueType fonts you must register all four variants or the BoldItalic lookup silently falls back to the base family. Taiki Noda https://nadai.dev/en/about Generate an invoice PDF in Go in under 50 lines https://gpdf.dev/blog/invoice-pdf-go-under-50-lines 2026-04-21T00:00:00.000Z 2026-04-21T00:00:00.000Z A complete, runnable invoice PDF in Go — 50 lines with gpdf, zero dependencies, no Chromium, no CGO. Here's the code and what every block does. Taiki Noda https://nadai.dev/en/about How do I use Source Han Sans JP with gpdf? https://gpdf.dev/blog/source-han-sans-jp-with-gpdf 2026-04-19T00:00:00.000Z 2026-04-19T00:00:00.000Z Register the TTF variant of Source Han Sans JP from Adobe's GitHub release with gpdf.WithFont. Seven weights, SIL OFL, same glyphs as Noto Sans JP. Taiki Noda https://nadai.dev/en/about Why gpdf is 10–30× faster than other Go PDF libraries https://gpdf.dev/blog/why-gpdf-is-faster 2026-04-19T00:00:00.000Z 2026-04-19T00:00:00.000Z gpdf generates a single PDF page in 13 µs and a 100-page report in 683 µs. Not a tuning trick — three architectural choices that compound. Here's the code path. Taiki Noda https://nadai.dev/en/about Why does my PDF show tofu boxes for Japanese? https://gpdf.dev/blog/tofu-boxes-japanese 2026-04-17T00:00:00.000Z 2026-04-17T00:00:00.000Z Empty rectangles instead of Japanese characters mean your PDF couldn't find glyphs for those codepoints. Here are the four causes and the fixes. Taiki Noda https://nadai.dev/en/about How do I use IPAex Gothic in gpdf? https://gpdf.dev/blog/ipaex-gothic-gpdf 2026-04-17T00:00:00.000Z 2026-04-17T00:00:00.000Z Register ipaexg.ttf with gpdf.WithFont. IPAex Gothic ships a single Regular weight under the IPA Font License — bold emphasis has to be synthesized or paired. Taiki Noda https://nadai.dev/en/about How does the 12-column grid work in gpdf? https://gpdf.dev/blog/12-column-grid 2026-04-16T00:00:00.000Z 2026-04-16T00:00:00.000Z gpdf's 12-column grid uses r.Col(span, fn) where span is 1–12. Column width is (span/12) of the row. No breakpoints, no gutters, predictable by design. Taiki Noda https://nadai.dev/en/about go-pdf/fpdf is archived too. Here's the modern Go PDF stack. https://gpdf.dev/blog/go-pdf-fpdf-archived 2026-04-16T00:00:00.000Z 2026-04-16T00:00:00.000Z jung-kurt/gofpdf archived in 2021. go-pdf/fpdf followed in 2025. Here's the Go PDF stack we actually use in 2026 — gpdf, the trade-offs, and why. Taiki Noda https://nadai.dev/en/about Japanese PDFs in Go: the 2026 definitive guide https://gpdf.dev/blog/japanese-pdf-in-go 2026-04-16T00:00:00.000Z 2026-04-16T00:00:00.000Z How to generate Japanese PDFs in Go in 2026 — fonts, TrueType subsets, mixed kanji/kana/ASCII, and why CGO and Chromium are unnecessary. Taiki Noda https://nadai.dev/en/about Go PDF Library Showdown 2026 https://gpdf.dev/blog/go-pdf-library-showdown-2026 2026-04-15T00:00:00.000Z 2026-04-15T00:00:00.000Z The Go PDF library landscape in 2026: every active and archived library, benchmarked on 4 workloads, with license and dependency details. Taiki Noda https://nadai.dev/en/about How do I embed a Japanese font in gpdf? https://gpdf.dev/blog/embed-japanese-font 2026-04-15T00:00:00.000Z 2026-04-15T00:00:00.000Z Register a Japanese TrueType font with gpdf.WithFont at document construction. Three lines, subset embedding happens automatically, no CGO. Taiki Noda https://nadai.dev/en/about How do I use Noto Sans JP with gpdf? https://gpdf.dev/blog/noto-sans-jp-with-gpdf 2026-04-15T00:00:00.000Z 2026-04-15T00:00:00.000Z Register the static NotoSansJP-Regular.ttf with gpdf.WithFont. Skip the variable font — gpdf's pure-Go parser does not read fvar tables. Subsetting lands around 30 KB. Taiki Noda https://nadai.dev/en/about gofpdf is archived. Here's how to migrate to gpdf. https://gpdf.dev/blog/gofpdf-migration 2026-04-14T00:00:00.000Z 2026-04-14T00:00:00.000Z jung-kurt/gofpdf was archived in 2021. This guide maps every gofpdf API to gpdf — a pure-Go replacement with native CJK support and zero dependencies. Taiki Noda https://nadai.dev/en/about