diff --git a/README.md b/README.md
index a07b7b5..aed8bf4 100644
--- a/README.md
+++ b/README.md
@@ -395,7 +395,6 @@ calc.go            the {calc()} arithmetic evaluator: parser, eval, validation
 data.go            data loading: fs.FS folders/files -> namespace tree, multi-source merge
 cmd/fejkdata/      the fejkdata CLI
 data/              shipped data (JSON), embedded at build: locale folders + a misc folder
-format-migration/  converters from the pre-release grammar; delete before the first tag
 ```
 
 ## License
diff --git a/format-migration/convert.py b/format-migration/convert.py
deleted file mode 100755
index 073d3ef..0000000
--- a/format-migration/convert.py
+++ /dev/null
@@ -1,72 +0,0 @@
-#!/usr/bin/env python3
-"""Rewrite data files from the class-char format grammar to the literal-text one.
-
-    convert.py data/sv_SE/person.json ...
-
-Old: 0 1 A a are character classes, # escapes.  New: text is literal; a run of
-0/A/a becomes {digits(n)}/{upper(n)}/{lower(n)}, 1 followed by n zeros becomes
-{int(10^n, 10^(n+1)-1)}, a literal brace becomes {{ or }}.
-"""
-import re
-import sys
-
-RUN = {"0": "{{digits({})}}", "A": "{{upper({})}}", "a": "{{lower({})}}"}
-
-
-def literal(c):
-	return {"{": "{{", "}": "}}"}.get(c, c)
-
-
-def convert_format(f):
-	out, i, n = [], 0, len(f)
-	while i < n:
-		c = f[i]
-		if c == "#":
-			i += 1
-			if i < n:
-				out.append(literal(f[i]))
-				i += 1
-			else:
-				out.append("#")
-		elif c == "{":
-			j = f.find("}", i)
-			if j < 0:
-				out.append(f[i:])
-				break
-			out.append(f[i:j + 1])
-			i = j + 1
-		elif c in RUN:
-			k = 0
-			while i < n and f[i] == c:
-				k += 1
-				i += 1
-			out.append(RUN[c].format(k))
-		elif c == "1":
-			i += 1
-			k = 0
-			while i < n and f[i] == "0":
-				k += 1
-				i += 1
-			out.append("{{int({},{})}}".format(10 ** k, 10 ** (k + 1) - 1))
-		else:
-			out.append(literal(c))
-			i += 1
-	return "".join(out)
-
-
-FORMAT_VALUE = re.compile(r'("format":\s*")((?:[^"\\]|\\.)*)(")')
-
-
-def convert_text(text):
-	return FORMAT_VALUE.sub(lambda m: m.group(1) + convert_format(m.group(2)) + m.group(3), text)
-
-
-if __name__ == "__main__":
-	for path in sys.argv[1:]:
-		with open(path) as fh:
-			before = fh.read()
-		after = convert_text(before)
-		if after != before:
-			with open(path, "w") as fh:
-				fh.write(after)
-			print("converted", path)
diff --git a/format-migration/reshape.py b/format-migration/reshape.py
deleted file mode 100755
index 81e5d8d..0000000
--- a/format-migration/reshape.py
+++ /dev/null
@@ -1,87 +0,0 @@
-#!/usr/bin/env python3
-"""Rewrite data files to the one spelling each shape has.
-
-    reshape.py data/sv_SE/person.json ...
-
-A one-item choice becomes its item; an object holding only a format becomes that
-string; weight 1 and repeat 1 are dropped; a repeated choice item becomes one
-item with a weight.
-"""
-import json
-import sys
-
-OPTIONS = ("format", "weight", "repeat", "separator")
-WIDTH = 110
-
-
-def reshape(n):
-	if isinstance(n, list):
-		items = [reshape(x) for x in n]
-		if len(items) == 1:
-			return items[0]
-		out, at = [], {}
-		for x in items:
-			key = json.dumps(x, sort_keys=True)
-			if key in at:
-				i = at[key]
-				if isinstance(out[i], str):
-					out[i] = {"format": out[i], "weight": 2}
-				elif isinstance(out[i], dict):
-					out[i]["weight"] = out[i].get("weight", 1) + 1
-				else:
-					out.append(x)
-				continue
-			at[key] = len(out)
-			out.append(x)
-		return out
-	if isinstance(n, dict):
-		d = {k: (v if k in OPTIONS else reshape(v)) for k, v in n.items()}
-		if d.get("weight") == 1:
-			del d["weight"]
-		if d.get("repeat") == 1:
-			del d["repeat"]
-		if list(d) == ["format"]:
-			return d["format"]
-		return d
-	return n
-
-
-def scalar(v):
-	return json.dumps(v, ensure_ascii=False)
-
-
-def one_line(n):
-	if isinstance(n, dict):
-		return "{ " + ", ".join(scalar(k) + ": " + one_line(v) for k, v in n.items()) + " }"
-	if isinstance(n, list):
-		return "[" + ", ".join(one_line(x) for x in n) + "]"
-	return scalar(n)
-
-
-def dump(n, indent=0):
-	pad = "  " * indent
-	if isinstance(n, dict):
-		line = one_line(n)
-		if len(pad) + len(line) <= WIDTH and not any(isinstance(v, dict) for v in n.values()):
-			return line
-		body = ",\n".join(pad + "  " + scalar(k) + ": " + dump(v, indent + 1) for k, v in n.items())
-		return "{\n" + body + "\n" + pad + "}"
-	if isinstance(n, list):
-		if all(isinstance(x, str) for x in n):
-			return one_line(n)
-		line = one_line(n)
-		if len(pad) + len(line) <= WIDTH:
-			return line
-		body = ",\n".join(pad + "  " + dump(x, indent + 1) for x in n)
-		return "[\n" + body + "\n" + pad + "]"
-	return scalar(n)
-
-
-if __name__ == "__main__":
-	for path in sys.argv[1:]:
-		with open(path) as fh:
-			before = json.load(fh)
-		after = dump(reshape(before)) + "\n"
-		with open(path, "w") as fh:
-			fh.write(after)
-		print("reshaped", path)